Although originally made for a Breezer Window, this product can be used on most trucks with a camper shell. Breezer Windows is a California auto glass company that manufactures the only aftermarket truck window that can be fully and completely opened. I am only selling the boot and boot hook that weatherproofs the connection between the Breezer Window and the truck cap/shell…not the window. The boot and hook add an extra water barrier and insulation. I have 2 brand new, (never used) boxes. Each box has a 12 ft long roll of boot and includes the hook. $35 each.