I've been trying to track down some oem seat frames for nearly a year now, and finally I find a complete set on Ebay out of a '72 CJ5. They arrived yesterday, so I took them out to the Jeep so I could finally see my Jeep with some seat frames in it. I sat the passenger side frame into position first, and the bolt holes lined up perfectly. I sat the drivers side frame into place and the front bolt holes lined up, but the holes at the rear of the frame are a good 2-3 inches off. What am I missing? It looks as if although the frames look identical, the mounting is slightly off between the '66 and '72 frames.