The ten-spoke inflatable(or so-called 1LE spare even thought it was out before the 1LE's were)will fit the front dual-piston alum caliper, but not the rear PBR's. The another alum spare, RPO N64, which came on many 1989-92 cars with PBR's, 1988 1LE cars, and 1989 TTA's that will fit all four corners.
The correct spare shouldnt be that hard to find, take the GTA's for example - total amount of GTA's that came with the N64 spare: 6,913 in 1988(9765 total), all 1989 GTA's(8470 total Y84 pakages including TTA's), 874 in 1990(884 total), 1,973 in 1991(2,035 total), and 225 in 1992(226 total)
Thats 18,455 cars out of 21,380 total cars built between 1988 and 1992 that had the correct spare, or about 87% of all 88-92 GTA's - not counting Canadian production units.