For at least some A-D years (and maybe all A-D years), the door stops were different for Panel trucks and Suburbans. The Panel truck rear door stops had two "stops", one about half open and the other full open (supposedly to allow the truck to back up closer to a loading dock). The Suburban rear door stops had only one "stop" location.

My Suburban rear door stops do not have a rubber bumper (but, I am away from home and my memory is bad - I could be wrong).

A link to pictures of the two styles were posted in this forum a while ago. If I find them after search, I will post the link.

Tim