Harlan Question
I've seen it done a couple different ways. First is replacing the vent w/ a rubber grommet. The gromment should provide enough "hold" on the light. Second is to actually use the vent piece w/ the vains cut out.
Just take the insert out, dremel out the vanes, slip the light in and put the insert back. Its a snug fit and it looks great.
Good Luck.

