Originally Posted by gspdbill
Don't know why it's called "gear box cover"
So, how much trouble is it to just replace the metal cover? It's an expensive part ($280) so I'm not thrilled about it but.....
It is called a gear box cover because it covers the timing gears. Remember BMW calls the input shaft to the gear box a drive shaft.
Don't buy a new one buy a used one, I have a few in black and others must have some silver ones. Or clean it paint it and run it with 3 of the 5 screws. I have seen several with one or more broken off screws.