its the Cardone 276550. I believe 3/4 would be the original and the new one is about an 1/8" smaller.

That's the same cast iron color I used on my original, so I will go with it again....I likely researched it at the time, but unfortunately my memory is great, but its a bit short..

LOL, now that I'm in there the LBMs need a new coat of POR manifold paint (which I have to order as my can went funky) so may be a one week swap! Oh and I have the heat riser pipe that has spent the last year on the wall....may as well put it on too!