With so many different types of beetle gas tanks, I'm looking for the one that has the filler in the middle of the tank. Is this a custom gas tank or is it a specific year and model of tank? I am wanting to put a gas tank in the front of my manx and there is an opening in the middle of my hood for the filler. You can see in my avatar picture. Currently I have an aluminum tank in the rear of my buggy. Any suggestions?