I have a 08 rubicon I bought it wrecked in the driver side. Well after putting on a new rear panel I noticed the gas cap isn't meeting up the gas line runnin up to the panel. It's seems like I'm missing some part that goes from inside the circle gas cap part to hook to the tube running up. Any help would be appreciated. Thanks

 

The easiest way would be to find another JK owner and ask to look at the gas line cap setup.