I just got done putting my slider window in my '76 D100. The rear window gasket I ordered from the Dodge Connection was just what they said it was. In fact the installer said, it was one of the best fits he's ever seen. As for the people, everyone I talked to was very helpfull. Kim even got hold of me on a question I had, as she was boarding a plane to do other business. They're business is part time, but they'll help you as if it was full time.
Mike