.75 bearings are fairly easy to get hold of, burton power list them I think, I can't say I have ever seen 1mm oversize, but I'm sure that Chip is talking with good authority . I have been told by a number of tuners/engine builders that a .75 crank won't last long at anything over stg 1, hence why I bought a complete bottom end for £800 with a 200 block and a std/std crank, as It worked out cheaper in the long run.