this is what makes me believe they are the same. i would like to know for sure. it's been at least 15 years since i worked on E body window parts. i sold or scrapped all of my window regulator parts i had laying around several years ago. i don't have any for comparison purposes.

i will probably get flamed for this. but in my opinion the regulators are all the same. between ht convert cuda challenger.
yes the cranking parts, handle studs/ arm with gear, are different, but they are just held to the regulator arms by rivets and bolts.but the arm parts that move the window up and down are all the same between all of the E body cars. drill out some rivets, change a couple of parts and you just made a different regulator.