Speedmaster Stainless Rocker Arm Bushings

Chances are the bore in the arm is too small and pressing the bushings in collapsed them and they were resized by reaming them. So buying new bearings may also collapse when pressed in. You could buy a hand reamer and accurately size them, but it would still have some tooling marks but not as much as a production reamer. I would look at the carr McMaster web site or Grainger website.