More updates: So, the first reman Vortec starter....the bolt holes were actually too big. Even with the GM bolts, there was play around the knurl. When I slid the GM bolts into the new 4.3 liter starter, they were TIGHT. The knurl cut into the aluminum while installing and made a nice tight fit. No more walking about! Didn't need any shims, as someone else here stated. It sounds nice and smooth when cranking. And yes, the 4.3 liter starter fits. I looked it up for a 2001 S-10 Blazer. Same cranking speed and everything. Now, just need a heat shield! So I've learned: don't buy a reman...buy new. And definitely use the GM bolts, NOT the Dorkmans.