You could always put the one you bought up for sale and buy the Street & Performance one and cut the spacers down to the length that would allow the pulleys to line up and then get shorter mounting bolts to mount it to the head.
Looking at buying these seats for my 71 Dart can anyone tell me what vehicle they may originally been out of?
Seat 6 Photo by tuckerracing10 | Photobucket@@AMEPARAM@@http://i252.photobucket.com/albums/hh10/tuckerracing10/Seat6.p@@AMEPARAM@@252.photobucket.com/albums/hh10/tuckerracing10/Seat6.p...