6 Lug Wheels
I have two 1966 F350's. One is a flatbed with 16" 6 bolt split rims and the other is a long bed crew cab with 19.5 in 6 bolt standard wheels.
Last week at an antique store I saw an old Sinclair Tanker F350 that had 19.5 in 8 bolt wheels. I have not seen those before