TRK,
A reamer is the sure ticket to a on-size hole but there is more to the story on spindle bushings. They need to be a nice palm press fit to the pin and most of this magic comes from having them in absolutely perfect alignment with each other.
As someone stated above, a Sunnen hone is perfect for this. If they are more than .010 under..or so, they should be reamed, but with a piloted reamer. This indexes off one hole as it reams the other hole (bushing) and keeps the holes perpendicular to each other.
This isn't something a typical machine shop would have. A automotive machine shop might have one if they have been around for awhile.
If your machinist is going to machine ream them in a setup that has aligned them through the bore then all will be fine but to hand ream each one separately is a different story.
Having the holes on size is part of the recipe, but having them true to each other is the other part.
Stuart
