Philip, If you using a fiberglass valance panel to sheet metal baffle, aka air dam, repro, let us know how how it fits. Several years ago, I tried one and it was about 1/2 inch shorter than the original metal. Hopefully they have corrected that since. Yes, the "J" nuts from ACE Hardware are what I used when I replaced mine that disappeared in the mid-70s. I believe the two on the ends are larger than the ones along the valance.
