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If you want the locking cap option from the manufacturer of your factory cap they are made right here in Oregon:
https://www.fueltankaccessories.com/
The part number that fits our trucks is:
FTA-C-04
You are only going to ever stop casual crimes of opportunity. Targeted acts by determined criminals aren't really stoppable. The best you can hope for is to make the criminal act more difficult in terms of time and expense.
You could replace them with one that has no handle making it much harder to remove:
https://www.petersenproducts.com/143-2-Series-T-Handle-Expandable-Rubber-Plugs-s/1898.htm
Find the right size unit that just has a nut and then you'll be able to really crank it down with a wrench and without...