I have an 83 SR5. It has power windows in it. This was not a factory option right? Must be an aftermarket kit?

 

yep , that's not factory , but maybe a dealer accessory ?

There was an "accessory" dealers here in Canada were offering , but it was the motor in a small rectangle box , switch on top , that fit over the window winder splines , they called "power window option" , maybe that something similar