Something you might try. The turn signal switch assembly for a 53-54 car is the same as used on 55-59 TF trucks. I think there is a good possibility it could be adapted to your 53 truck as well. Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes 1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes 2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans 1947 Willys CJ2A w/F-Head engine