Make sure you use the correct ring for where you're putting it on the bike:
Part # 1D6-83363-10
-00 is used in both the right-front & left-rear signals.
Part # 1D6-83363-00
-00 is used in both the right-rear & left-front signals.
This puts the 'stem cutout' toward the inside of the assembly to keep them flush.
Without taking one apart, I think it also puts the drain slot at the bottom of the lens.
Hope this helps you find one.