oil cap?

Geez, repops are $15. Probably cheaper at Autozone.
Being an old engine, i didnt figure it would be at the parts houses. Thanks for the heads up everyone! Speaking of gas caps, the one on my car is in good shape and the rubber seal on it is also good, but the cap fits really loose..loose enough water could get down the fill tube. I have to tighten it all the way and then back it off a hair for it to be tight. If tighten it all the way, its loose. this is a '72 dart, like i said, the cap is in good shape and all and so is the fill tube. not sure why its like this. Anyone else ever see this?