While I was looking through cars at the local wrecking yard yesterday, I discovered a couple of circuit breakers (real pushbutton breakers, not automatically resetting ones) in the knee pad of an early BMW 5 series. I wouldn't have bothered with them, if not for a suspicion I had about their size. After getting home, I checked, and realized that one with it's mounting bezel would fit nearly perfectly in a gutted SRS diagnostic outlet from a late 240, or it could be installed in a cut blanking plate in the center switch area.

I have no idea if I'll use them for anything, since I don't have any electrical issues with my brick. BMW installed them because the power windows in the 5s would blow the fuses if you tried to roll them all down at once.