Later model 19.5 rims that come off panel vans and small buses with a GM drivetrain will work on your truck. I have found that front rims have a different offset as compared to the rears on some trucks. On my truck I used fronts on the inside rears to give a little more clearance between rim and rear springs but I'm running a 14 bolt rear instead of the original. It may be a little different using the original axle. The only drawback I've found with the 19.5's is most all of the tires are 10-14 ply and are quite pricey. Hope this info helps. There's a picture of my truck at the beginning of this post.
