Ok. so after a little research. The mopar weather strip part number for the factory rear sliding window is 3494598. Of course this part number is no longer available. The weather strip for the flat glass and the aftermarket rear sliding windows will not work with a factory rear sliding window.

I found one guy that swears the 92-96 Ford F150 used the same rear glass as the 72-93 dodge trucks. The difference being the Ford has a thicker glass.. No idea, can neither confirm or deney that claim.

The one ebay listing for the 3494598 weather strip I found was for a item that had already sold, with a selling price of $240. I'm not paying that much for weather strip.. I'll go back to the flat glass.. Crazy that no one makes a reproduction weatherstrip for the factory rear sliding window on the 72-93 trucks. 19 years of production, still a few out there.. Josh-