Are the inserts and studs on the basses the same dimensions as on the guitars?
Modern ones are. Not sure about pre-70s cuz I've never pulled ones that old out of a guitar, but I would assume so (because prats were more the same between g and b back in the day , and from the few pics I've seen).
Tonepros are just stupid expensive though. The bushings are much better than modern ones (about as good as the early 80s ones, which are the same basic design as modern, but the knurls are still there and triangular vs smaller and further spaced vaults (rounded over).... not sure when the design changed, but the 60s ones have the knrarliest biting knurl and no top flange).