Check out the hub caps and what is with the left rear tire?
68 ford pickup

 

This is the new for 1975 Econoline stainless steel (not aluminum) E 250 and E 350 hubcap. Was also used on some 1977 and 1978 F 250 and F 350 pickups. If your running the incorrect newer bump wheels on your 61-66 F 250, this is the closest hubcap match to the original styling.

 

Scanned (using hand held wand) from 1973/79 Ford Light Truck Parts Catalog on microfiche.

Do you see a hubcap that matches?

 

This is the hubcap in photo. Not from 1968.