Not sure of the years BUT....
The only S10 that came with the 8.5 is the semi-rare ZR2 off-road package models.
They're far from a bolt-in but the ZR2 8.5 is wider than the standard S10's 7.5/7.625" wee 10 bolt.
My brother is parting out a late-80's (I believe it is) Suburban here with an 8.5 in it for sale. 3.73 geared, if I'm not mistaken.
Best of luck.