Originally Posted by
Schreck83
Most of the UO-8's I saw (1973-78) had the single drive-side shifter boss braze-on and the Simplex S 2954 shifter.
Here is an earlier discussion of stem shifters on UO-8's that have the cable stop braze-ons like the OP's photo above. The Flckr link in post #7 still works:
UO8 in WA State - What years had stem shifters?

Thank you. Super helpful.