A 65 would have 6 lug wheels so someone has changed the hubs but from what? If it has a 4 3/4" bolt pattern they are from a car.
If it has a 5" bolt pattern they could be from a 73-87 C10 truck.
In which case those wheels would have the correct hub cap "nubs" to use the 65 caps.
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