It looks to me that the coupler is out of a later model truck, perhaps 70's up. Does it have the original column? Does it have a power steering gear box? If so, it has been converted and stock parts are no longer applicable.
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