in my limited experience there are differences between different MODELS of Tange HS races, so even if the "ball contour radius" is the same (not sure what the technical term is but that's how I compare races), they will vary in thickness as well as the grooves machined for the thin plastic seals that some use.

It's been fairly easy to find the crown races (26.4 or 27.0) sold separately for the Levin, but not so easy to source those, or any other races, for other models, IMO, but YMMV.

So it hasn't been an easy "mix-n-match" proposition with pieces from various models interchanging, which has been a frustration, but reality, for me..