A Parts Dealer rep said I can have the Wrangler locking gas cap keyed to match the ignition key as it will fit the KJ... better than the crappy small keyed locking gas caps:

Wrangler
Prevents theft or tampering with fuel. Keyed to ignition by dealer. Quick on/off quarter turn release locking gas cap.

05016763AC (Wrangler 2001 - 2005 Only) It is pricey @ $50 or so

Anybody have this and how do you like it?

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