Was just at PartsHeaven near SFO last week. They had 4 968s being parted in the garage in addtion to their normal warehouse stocking. One of the Cabs had rear seats, both bottoms and backing. They are pretty quick about pulling a part and shipping if you want to give them a call. Prices there are fantastic. I ended up pickup up a few pieces I didn't need, just because I felt guilty leaving there without at least leaving a C note or two. I even sprung for a 968 piston and rod to be used for a paperweight. Good luck.
BTW, my bad, I should have posted before I went to see who needed what. It was a last minute thing while I was out there for business.