I am wanting to replace the back window of my '95 XLT longbed; I was considering a sliding glass rear window but last night I wondered if anyone has ever tried adapting the rear window glass and window motor/regulator from a Bronco....

 

This is exactly what I had in mind....

 

I'm thinking that if you use all the inner workings of a Bronco rear window, i.e. the factory window switch, regulator, motor, guides, and a modified F150 fixed window glass, it should be do-able...