These fuel tank filler necks now come with the collar at the top of the pipe to prevent it from being pushed down inside the body of the car. They are also fully zinc plated and fit correctly.
This is a list of alternate part numbers you can use to cross-reference for your Austin Healey
APP # BN4-BJ8
AH # FUL106
OE # AHB8315
Quantity per vehicle =1