My 710 cap is missing on 1991 Cadillac Fleetwood

Can not find a 710 cap at any stores.

please explain 710 cap?
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2 more answers , 2 more comments
I'll bite...710 cap....right ...turn it over and its the OIL cap...
wow good job the dealer. is this a joke?
I hope it was a joke....LOL
You will have to go to a dealership to get it replaced. Also try a gas station or 2 and tell them that you lost the gas cap. Also keep a rag stuffed at the top of where you put the gas into, so that it will not slosh out of the tank when you drive. Because if you do not keep that stuffed in there until you get the new gas cap, then you will have a fire on your hands for sure.

Hope this helps.