What size front wheel does the 81 have?
My '81 has 18" snowflake wheels, front & rear. I haven't heard of any OEM R65's having a different size, or two dissimilar sizes on one bike.
Are there any ways to check if we have got the right model? Does a R60/R90, etc center-stand work on a R65?
I think your best bet would be to find one that was OEM for a SWB R80 or R75 (SWB, also), and I would be very careful about those, even. The R65 supposedly was a pilot for larger SWB bikes, but who knows?
Yep, the correct term would be Reynolds Ride-Off Stand, but since you were in the military for so long, I should have styled it "Stand, motorcycle, ride-off, Reynolds, mil.spec.xxxxxxxxxxx.
Close, except for two things:
1. It's more accurate to say that "I haven't been in the military in so long." (See #2 below.)
2. Mil.spec? I don't recall that term existing, back when. Then, catalogs and TMs identified items by FSN (Federal Stock Number).
At the risk of instigating an OT rant, I'll state that I've had the impression that the principal beneficiary of the "milspec" has been not the military, but rather the contractors. I'm of the subjective opinion that there are very few items that last long enough, are reliable enough, and their non-milspec counterparts to justify their higher cost to the government.
I have some examples of procurement stupidity — small quantities of nonstandard items that must be custom-manufactured because of their nonconforming specs, thus driving the unit cost through the roof — or concepts that were so ill-conceived that even the contractor tried to dissuade the military from buying them. Because I don't want to give the Forum Czar heartburn, I'll save them for later.
JT