Hoping someone can help... I had an issue with a gap across the upper windshield molding where the front edge of convertible top header molding lip meets it. IMO the front lip of the header molding should wrap over the front edge of the header and the lip should drop below the upper windshield trim. In my case I even used a thicker windshield and 3/8" butyl to try and keep the windshield high enough so the moldings around the windshield would have no gap and the moldings would be kept higher so the chrome header molding lip would fall below the upper windshield molding. My passenger side header molding did drop below the upper w/s molding, but my drivers side had a considerable gap between the header molding lip and the upper w/s modling. I also notice that the lip on the passenger side header molding was longer or deeper than the drivers side. I bought these repro header molding back in 2011 and when i tried to install them, fall of 2014, I realized there was a quality issue. The pontiac restoration parts company (who shall remain nameless) tried to tell me it was the installer. When I asked him if they ever installed these before, he said no. I tried to show him the difference in the OE vs Repro and he just said they don''t see it. Oh well, I am going to try and buy another set hoping that the ones i bought back in 2011 are improved upon or I got a bad set last time.
Does anyone have a recommendation or are they all made by the same company?

I don't think anyone makes these that fit. Best bet is to have some originals rechromed.
I think Harold on this site may have an xtra set of originals. Maybe PM him.

Got some pics of the OE and repo part?

Why not identify the supplier... it may make them lift their game if there is a problem and provide feedback to the manufacturer if it's not them.

I bought a set in 2000 also, also had "fit " problems...I think most repops do not fit correctly....best is to redo originals IF not totally destroyed.

I had the same problem, the aftermarket stuff is just plain trash !!! I think the maker is oer sold by firebird central, but it looks like all the other vendors sell the same thing. I got the repops on but thats about it. Looks some what ok at 20 ft. I still have the originals which I will send off to have them redone at a later date. The originals were hard to get off anyway, but looks like I didn't trash them to bad. I have the problem on the pass. side with the moldings not sitting right. The driver side fit was better.

It has been several years but I believe they were made by CHQ ( Classic Headquarters ) in Georgia back then. After purchasing a set I tracked down the manufacturing company owner to discuss the inferior coating of the "brushed chrome". I never got to the point of attempting to install them because I sent them back to the vendor, Classic Industries. He had explained to me that he could not use the process they used to create the robust brushed surface on the originals. I still have my originals on the car.

Were yours made by CHQ ( I believe that will be stamped on them) or Dynacorn? I'm going to be buying a set of the Dynacorn header moldings in a few weeks and have them installed. As far as I know these are the only 2 manufacturers of these header moldings. From what I understand the Dynacorn pieces are a little better.

Sorry it took a while to respond to all of you... work has consumed most of my days.
Anyhow I thought I would upload a couple pics and share what i found should others have this issue.

1st ) After ordering from numerous vendors & returning a few sets which I could tell were already opened and probably returned for similar reasons, I finally came to the conclusion that all of the ones i got my hands on appear to be produced by the same parent company.

2nd ) I went through all the possibilities why these header moldings were not falling far enough over the forward edge and under the windshield moldings themselves...

a.) is windshield high enough or thick enough when installed? I used 3/8" butyl tape to install the w/s
b.) is there something under the header moldings causing them not to sit flush on top of the header frame (across the top of the "A" Pillars? After the second set I verified that there were no spot welds or other reasons they were not sitting flush (my windshield frame was original).
c.) is there a reason why the windshield moldings may not be up high enough to cover the header moldings? This was, i believe, one of the reasons I had an issue. I decided to check out a couple resto companies and see what was offered in the area of Windshield molding clips. I purchased mine from Perf Years since they were right around the corner from where i live. In this case I don't recall more than one option. Unfortunately my buddy had installed the Windshield after we painted the car and I don't believe we saved the orig molding clips. I decided to check out a couple other vendors which provide parts for all F-Bodies and came across a separate listing with Firebird Central, one for coupes and one for convertibles. Looking at the pic on their site raised my hopes since the difference in overall clip height seemed noticeable. I ordered a set. You can see a noticeable diff side-by-side. I installed these convertible w/s/ molding clips, the header moldings, and the W/S molding clips. This provided me an improved result, but not a 100%. Two noticeable defects. One is where the two halves of the Header moldings overlap and the second is how the W/S moldings bow up in certain area's and seem extremely tight (pulled close to the w/s) in the center section. Alas, I am done playing with this (shed enough blood & sweat). The defects are only noticeable if I point them out or you are looking for it. But if someone has some remedies for the issues I am pointing out let me know. BTW, I also purchased a second set of W/S molding hoping a different vendors would fit better.
Albeit, while at the Camaro Nationals we went around critiquing everyone's header molding to w/s moldings and i can honestly say that 3 out of 4 were not much better than mine. The onus i still believe is on the Header Moldings themselves, but using the correct clips help also. I'm wondering if anyone has a set of original w/s molding clips we could check the height on for comparison. Also, maybe check the depth of the forward edge of a set of original header moldings.

Hope this helps others.