Assuming you mean an OEM switch with the headlight switch also?
I don't have a spare, but there is an LT500r switch on ebay right now.
It is a different part number from the LT250r, but I have a 500 and a 250, and they look identical at the handlebars. Maybe there is a difference in the wiring somewhere, but the rest of the ignition system is the same, so it can't be much.
Good luck