The reverse light switch is reproduced--it is the same switch that fits a Muncie trans in all the chevy stuff. I can't remember if the repo switches come with the wires attached to them or not. The two wires that attach to it terminate in bullet connectors--the same ones that are on the backup lights, so you can harvest them off a set of no-good backup lights. The only difference is the wires in the backup lights are green, so to be correct, you would need to put some vinyl paint on the wire insulation.
The bracket is what is specific to the T10 and that is NOT reproduced, so don't lose the bracket that attaches the switch to those two side cover bolts.
If you need someone to go through the trans, send it on down here--I have rebuilt more T10s than I can count and know the tricks to keep them from jumping out of 2nd gear when you let off the gas and coast down.