Bill, is these what your using?
http://www.classicparts.com/1947-63-Window-Regulator-Rollers/productinfo/18-795/If so here is MY experience with them so take it for what its worth.
When I put these new rollers in I found that when I ground off the back, and knocked the old ones out, that the hole that was left was to BIG for the new rollers stem. I then had "stems" specially made by a bolter friend to fit the hole in my regulator arm but still used the plastic rollers.
**what I should have done was grind the old stems flat and NOT punch them out. With them ground flat I could then center punch/mark the center and then drill a hole the size of the new ones I received...put the new ones in and then peened them a time or two to make sure they hold in place.
Hope all this makes sense?!
The current repops may now have the right diameter "stem" but I would not bet on it. If you have any questions maybe we could discuss it over some BBQ at Charlies or here at my shop. I have an extra one on hand.
