[Rick Becker]

There's also the question do you intend to keep your 912 absolutely stock, or modify it if you believe the change is a significant improvement?

-The early 912s weren't required to have headrests, and most early seats don't have them. There were optional headrests available, 356 cylindrical style attaching to the seat backs.

-By 1968 with additional U.S. safety requirements, Porsche changed the headrest design to attach to the top of the seat back and rotate, allowing vertical and forward adjustment.

-The seat design kept evolving. With the LWB cars the location of the legroom adjustment lever location flipped, and included a shear pin, presumably to strengthen the seat restraint since the outside seat belt anchor plates were relocated from the frame to the seat itself. Reportedly the revised angle/position of the lap belt is an improvement.

-The release to allow the seat back to be folded forward for rear seat access was moved from the bottom of the hinge mechanism to the side.

-The headrest shape changed once more, higher with a curved leading edge, which can rotate farther forward.

Several years ago I purchased a pair of 911S seats about 1972-73 vintage, and as discussed in others' posts, I could not readily slide them off their tracks and onto 1968 stock tracks. However I discovered I could fit the driver's seat to the passenger side, and visa versa. Yes, the seatback angle levers are above the center tunnel and almost touch, and the seat back releases are also in the center. But personally I would take the later seats any day of the week over a 1968 seat with no headrest.

My $0.02