When rubber slats on the quarter vent louver are gone, water sprayed horizontally (such as from car wash) could get inside the body panels and cause damage such as shorting/corroding the rear window/wiper control relay module.

Could have used mountain bike inner tube but did nothave any handy so, I used rubber sheet from Marshall's Industrial Hardware that's approximately 1/32-inch thick to make the slats...


Here I marked where to slit/poke holes for mounting...

Assembled:


Assembly detail:

I used soldering iron to remove mushroom head on plastic heat stake and re-staked after installing slats.

Here are retainers needed for First-gen MoreFunner...


It is almost impossible to remove vent cover without breaking these retainers so make sure you have some ready before starting the project.

Upper retainers are PN 62955-89101, 4 per side on first-gen MoreFunner
Lowers are PN 62955-91C01, 1 per side on first-gen MoreFunner





Louver re-installed: