I've got 2 tanks....One came out of the 54 and another one that has a fitting on the forward side of the tank. I've got a new fuel sender/pick-up that has a female inverted flare interface. I'll have to check my receipts to see where I bought the unit and check it's application. I think it may have been for a pick-up truck.

It seems odd that the same tubing would fit both tank configurations.