Anyone mind pointing me in the right direction in regards to which way this gas cap cover is supposed to go? One side is less thicker than the other side. If any1 can elaborate with some pics that would be great.

 

With the over fender on the car, its obvious then way it goes on. So obvious in fact, it will only fit one way so it will be clear that something is wrong when it doesn't fit the way you try and put it on