I have a 66 1/2-ton Fenderside that came with bucket seats. It also has the 351 V-6, TH-400, PS, PB, AC (no longer complete), Spicer 60 rear axle and Custom trim. Seems like the original owner ordered it with ever option that was available. The buckets are the same was the ones available in 67-68, some guys refer to them as "Buddy Buckets". I didn't know they were available in 66 until I saw them in this truck. Seems to be a pretty rare option for 66.

Bob