I thought rear 3 points were in the late 3rd gens (90-92
). All I'd think all you'd need is those belts & the brackets they bolt to, which, w/o actually knowing, I woud assume spot weld to the rear just like all the 4th gens (which might also work for you. You'd likely need the right rear plastics too (or cut holes in yours for the belts)
If the above is true, it's a no brainer. But I could be 100% wrong.