Quote:
Originally Posted by dmsfrr
I've been told the '55 T-Bird gas caps need to have a recessed center (attached photo) so it will clear the mounting studs of the emblem on the fuel door. Not sure how true that is, mine is flat and it seems to work fine.
Just something to be aware of.
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GOOD POINT !
The MPC shows service replacement as B9A 9030-C (1955-59). That crosses to a STANT PN which I had but lost (but can look up again if needed). I am sure they took that into consideration.
Same as don't slam the hood until you are sure ... 
EDIT -
OK ... The B9A 9030-C is shown below. Completely different from the original filler cap -
Also, FORD 49/59 MPC showing replacement cap. S is the application ID for the BIRD in the chart.