I believe you are right. It looks like the "T" is a fabrication, welded on. Never saw an original with fins on the bottom of the rear part. Concealing the welds is probably why it is painted wrinkle black, which the originals never were.Except that it NOT a repo of a Cobra pan, The bottom side is funky so just an approximation of a Cobra pan !!
Might even be a modified Cal Custom,Need some better pictures.