Lockable gas caps?
Push-on locking gas caps require no turning to secure the cap on the filler neck - simply press to lock. This style fits the older cam-style filler necks.
Threaded locking caps are designed for vehicles with threaded filler necks.
Quick-on caps are designed for late model vehicles with the 1/8th or 1/4-turn features.
Only problem is - I'll be damned if I can rmember the P/N - but at least you know there is one out ther available.

Forget the numbers in front. Its perfect fit . It also said it fits other cars think newer grand prixs and said 99 to 2002 firebirds so 98 might be different. It was different from the cap I have on the car. There is no strap on them but not overly worried about that .
Its a good idea to have locking cap on these cars since they didn't make the fuel doors lockable.








