these are the same bearings as I have on my "pistons, bearings, rings" for sale add-- I have one RHP England MRJA1.1/8 JC2 DRIVE SIDE roller bearing in C2 clearance-- part # 70-2879-- $40 + shipping- this is BRAND NEW NEVER ran and are speck'd as correct for many of the later years of the 750 twin models -- I installed the outer race, tested to see it was too tight for my 67 650 project, and removed it. This was done by heating the engine case, dropping in the outer races, and reversing the process to remove. Absolutely no damage to this bearing. This bearing has 10 rollers and a STEEL CAGE-- Original box, clean, oiled, as new. If your interested you can PM me or reply here.
--also have a NOS 4 speed transmission high gear main shaft bearing - $40 + ship