I believe that the one on the right was originally intended to attach to the stem on a universal carrier.
I have asked this question myself as I have a HUP as well and I installed two ebay mirrors on it. I kept the little bracket in place as it aids in keeping tension on the mirror arm.
I have also seen ones like the one on the left whereby a piece of tube is substituted for the bracket to use on trucks.
Which way is correct? Does it really matter?
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3RD Echelon Wksp
1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1943 Converto Airborne Trailer
1983 M1009 CUCV
1957 Triumph TRW 500cc
RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......
OMVA, MVPA, G503, Steel Soldiers
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