My pickup has 12 Allen screws, can another screw be used?
You can use various head styles in place of the 12 Allen screws. You need to use the same thread, shaft diameter, alloy (steel or ferrous) and length needed to fit properly. Some of the screw heads you can use are Fillister slotted, Fillister phillips, Socket set screw, Button head, Round head phillips etc. There are many head types that can be used and consult a screw distributor and ask for a catalog.