I don't know how much research you have already done, I have replaced the switch on my '61 and got it from NAPA easily. If you need the key mechanism as well, try Impala Bob's, Eckler's, Year One, Classic Industries or C A R S, Inc . These are all fine companies and have helpful staff members that know your parts. Good Luck

Hi 50fordpu: I don't have a new one but will have a good used one with keys from one of the many 65/66 Chevys I've parted out. If you think I can help let me know. I'm in Lethbridge Alberta Canada. New to this site, so here's my email if needed [email protected]