Man, you missed it by a month. There was one of these at Pull-a-Part in december. I grabbed the front seat for my RA29. I knew the guy that sold it to PAP, could have beat him for doing it.
I saw this car first in Edmond and stopped to talk to the owner then. Surprised to see it on Craiglist a few weeks later. Glad to see it got saved and went to somebody who appreciates it. There isn't much of a JNC scene here mostly honda and drifters. The 76 Celica is still off the road for suspension work, but hope to be back on the road soon. I do drive the 85 celica around quite a bit. So if you see a white Celica with a red hood, wave.
As to your lock situation, can you get a pic? Believe it or not, Toyota did a lot of cross pollination of parts back in the day. The seats and rails from your car, fit right into my 76 Celica. I am thinking, that your lock set up is probably the same that is in the hatch of my Celica. If so, I should have one or two laying around that you can have.
Just found this, does it look right? http://www.michaelhyde.com/Toyota-Rear- ... p_391.html
If so, believe it or not, those little plastic clips are still available from Toyota. Best Toyota dealer to ask for old parts is Momentum out at NW Exp and Council. They have found and gotten plenty of parts for my 76 Celica. We will have to meet sometime. I do head out to cars and coffee quite often. 1st sunday of every month at Penn and Memorial behind the Texas Roadhouse.