70 duster ecs fuel neck tube

70 and 71 Duster and 71 Demon the flange is on the inside or the quarter. 70 usually has the nipple for the small vent tube. But some california cars in 70 had the ecs style like 71 with no nipple. All duster Demon had three screws for attachment, Darts and Scamps had 4 screws and cannot be used due to the quarter panel being flatter on that body style it warps the quarter. Also the caps for 67-70 and 71 do not interchange. 67-70 caps do.

I recently put 72-76 quarters on a 71 Demon. I come to find out I needed to use the 72 -76 fill tube because the indent for the tube was deeper