A few years ago I saw a 73-75 K5 with a pickup tailgate and a hard top. The rear window was a camper shell type window. Was this an option if you fitted a hard top to an original soft top model? I have seen pickup tailgates on rag tops but never on a hardtop. I'm thinking of trying to fit a camper shell window in my hard top so I can stop fixing my roll up type. Has anyone done this before and how did it go?