I can't remember if it was an 89 I measured up, but it was an extended cab that got rolled. Wheelbase was just about 117", and I am still considering it for my 1940 Plymouth 2 door sedan (same wheelbase). It would be a very close fit. Best to check the WB, then motor placement and firewall, and of course width of the S-15, and the vehicle you are interested in.
Best o' luck
Matt