mustang gas tank identification.

I have a 66 mustang 289. my fuel gauge does not match the tank size I believe it is a 16 gallon tank.
the gauge does not register correctly .I bought a new sending unit Scott Drake for a 66 mustang twice .
neither one fits.is there a id# on the tank i can check to see if it is the right tank?



Thanks.
Halloween.
 
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Probably not a number on new tanks these days
When you say it doesn't fit, you mean into the tank?
post a picture it might help.
 
So I guess the old square shaped o ring is still imbedded in tank? Hard to see sometimes.
need a wire hook to pull it out