Not sure about the spare pieces, but the window regulator is shot--those broken teeth are the reason for the noise at the end of the up cycle. It's not a terribly difficult change. The new regulator will kind of naturally align itself, and it only goes in one way. Good luck.

__________________
Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)