I'm not trying to throw a wrench into this subject, but there is more to the "proper" gas cap, than if "it fits".. It is (unfortunatly) a part of the emissions system...(Hear, click, click, click) and in alot of places, most of Arizona for one, must pass that test.. Around here, they vacuum check them among other things..Hopefully, the locking caps you are buying won't "fail" you...
Off topic, but is there a spell checker on this site? I always hate feeding the "Spel Pulise", but am wearing my dictionary out.. Thanks...rgr...