[68 C-10 Panel]

Hey guys, I am trying to wrap my head around the differences in the panel truck floor pan vs the pickup. I am looking to order one from GMC Pauls, its a Key parts pan I believe, but now that I'm looking at it I'm not sure its the right one. I looked into some threads on here and see that mine is flat all the way to the back... the truck seems to have a rise on the last couple of inches.

Is there a panel correct floor pan I should be looking for?

Any help would be appreciated... Oh and of course I'll get some pics in here.

Thanks!