80's models back door window glass

I have heard that the back door window glass on a rear-wheel-drive brougham is the same as the ones on 4 door LeSabres, Bonnevilles, and Caprices of the same era.  Does the 4 door Seville and Eldorado of the same style years have the same shape/size rear door windows? I am looking for some options on finding used interchangable parts for my Brougham.  

Seville rear glass is different, both the moveable window and the fixed piece, same with the Eldorado, it too is different then the brougham, and the Sevilles for that matter... and finally, there are no 4 door Eldorados past yr 1960 (  the limited production Eldorado Brougham).. not sure where you are but there are TONS of the senior GM cars in the salvage yards here ( southern California) where you can get suff off of, especially glass for CHEEP.. probably the same where you are too if anywhere in the US.