get the threaded. i bought the quick on and had to return it. there are not different threaded models. the diameter of the thread is standard.
Stant
Stant locking gas caps are available in three basic styles, depending on application.
- 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.