yeah this stuff is real common especially in the 80s 3/4 tons, as common as hookers in NV, i should still have a couple of the switches laying around here somewhere but i just tossed all my harnesses pile in a Z28 camaro i sent to the shredder last week, got sick of tripping over the wirs, so i said bye bye damn harnesses!
so dont think i have any of the wires anymore, but it is orange and is spade end
easy to make one
and the switch well it is a reeal basic simple contact switch, you could use just about any kind of a two-wire contact type switch if you can mount it to the pedal bracket somehow
good luck