[tommy_waffles]

which gm veichles bucket seats are the same as the chevelles (1966)

 

[67shovel]

Technically none. 66 had no seat back lock and metal trim pieces. The rest had locks and then in 68, plastic trim pieces. 66 - 72 Chevelles are about the same though, along with all 66 - 72 A-bodies (GTO, GS, 442).