I pulled a set of FWD '87 Celica GTS seats for my ST165. They're cloth, but I prefer that anyway. The GTS seat tracks are also 1 inch wider than the ST165, but the cushions are the same - simple fix, pull the plastic side trim and rear panel off the stock seats, 4 bolts for the seat back, 4 bolts for the bottom, undo 5 hog-rings from the bottom of the seat back, swap the slider /recliner frames from the original seats, reassemble.
This is what I had originally
This is what I'm swapping in right now - these are the FWD Celica GTS seats, it's the same design just in fabric.