Custom Gas Door

I saw this gas door setup on a truck the other night, but I didn't get a chance to ask the guy where he got it from. The door or the cap was very small and when he removed it there was an opening only large enough for the nozzle to fit in. Does anybody know where I can purchase one of these? Thanks,Dan

That should be a harley gas cap and filler. They are around $50-$60 bucks on e-bay I think.

Thanks