Lehner Bearing Sizes?

[hyperasus]

I just got ceramic bearings for my 1920 and Lehner basic motors(4x9x4 flanged). You can't imagine what a pain in the ass they were to get. Took me forever and I finally got avidrc to get some in for me. I'm thinking of getting ahold of them and try to get some ceramic revolution bearings for the 1940 and 1950 motors. Those flanged bearings are very hard to find in ceramic...and almost impossible to find both sealed and ceramic.