I have read that the 78-96 uses the same rear seat brackets and pins.
Don't think there are new ones being produced.
I've noticed that sellers on CL usually have a hard time selling rear seats. Might be able to pick up one on the cheap or try a wrecking yard.

Be prepared though, the bolts are usually a bugger to get out unless it has been done recently or was reassembled with anti-seize.

 

This may not be exactly the easiest option, but I found a great complete backseat from a salvage yard that I found on Hollanderparts.com. I think I picked up the seat with all mounting hardware for about $75. If you are not familiar with it, I like it better than car-parts.com because many of the vehicles have pics so you can see if the car has other items you may need. Good luck.

 

I have some give me couple days to dig them out. email me at Jssec@aol.com will send you pictures.