The rear sliders had a design change from the earlier trucks to the later. But they will all interchange. As far as the flat glass, I think they were all the same. Some have said the thickness of the glass, be it windshield, door, or rear got thinner on the later trucks, but that is unconfirmed to my knowledge.

If you remove and plan to reuse a slider, be sure to save the gasket. Last I knew there were no suppliers for replacements.