Jason:
I did the same thing as you. IIRC you can put the "tab stop" (?) on
the pod side, away from the lever, in a couple of the 4 possible
positions. I happened to have a pair of the ones without the tab that
I used, but as said above, there are about a billion of those washers
out there.
FWIW
I would have sworn that my shifters came with both styles. In any
case I would expect any good bike shop, or Riv, has a pair of these in
its spare parts drawer, that not that rare since they were on
virtually every road bike, with bar ends, sold for many decades.
There's more than one size floatin