Most of the time they call it a window repair kit. The following is a like to just one of the many that are on E-bay all about the same price.

http://cgi.ebay.com/ebaymotors/79-95...QQcmdZViewItem


There are three per motor, so this will do two of them.

 

Thanks for the ebay info.
I founda rebuild kit that includes the nylongear, the bushings, and the metal drive gear (supposedly), with grease, for $20.63 + ship($10.09) from http://www.lighthills.com/. It's the only complete kit I've found.