The rear spoiler partially blocks the rear view out of a convertible. I removed the spoiler to increase rear visibility, but only temporarily plugged the mounting holes. The spoiler can be put back on at any time.
Nylon plugs from Ace hardware. They come in black or clear nylon, and in several sizes. I needed five 3/8" plugs and one 1/2" plug. Before installing them, I put on two coats of Performance Red touch-up paint.
I sealed them in place with a swipe of silicon sealer around the edge of the hole. They look like factory-installed rivets, but they can be easily removed by just pushing up from the bottom.