Contact any Bass Pro that sells Tracker and they should be able to help you out, maybe go to Tracker web site, I am sure they have a customer service contact there also.
Welcome aboard howard. Does it have to be OEM? If so your best bet is to call Tracker directly. I've had pretty good luck going that route. That said, that's a commonly used switch, so if you're insisting on OEM because you think that's your only shot I'd say keep looking. Good luck.