Question: Spare tire lock

[Corvette1978]

I just recently purchased a 1978 Corvette and i am trying to get the spare tire lock loosened up enough to get a key into it. Can anyone tell me which key opens this lock, door key, fuel key or a individual key from the factory.
Thanks, Jeff

 

[frank_nesta]

Door key.... Oval key.

 

[bill81vette]

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