Here is an Ebay auction for an NOS C5OZ 13341 B turn signal switch by Ebay member "mrrmatt" with a Buy-It-Now of $200.00 or make offer:
This is a rare find for Mustang and Shelby GT350 enthusiasts! A brand new turn signal switch in its original box, with the manufacturer part number C5OZ-13341-B. This vintage part is a must-have for collectors and owners of classic cars. The switch is specifically designed for 1965 and 1966 Mustangs and Shelby GT350s, and bears the Ford brand. It is a genuine, new old stock part that has never been used, making it an excellent addition to any vintage car restoration project. Get your hands on this piece of automotive history today!
-Fred-