For many years Egge reproduced the actual cam roller and pin assemblies, but announced a few years ago that they were going to stop production. IIRC they later reversed themselves, so first thing to check is if Egge still has the rollers and pins. Now the arms used in the 7th Series were the original stamped steel type, later replaced with forgings; for these you're going to have to look into the used parts market, Kanter would strike me as the best bet. If not, start looking for a junk motor - the arms themselves are the same for both the 320 and 385 cubic inch engines though of course the housings and shafts are different.
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