I put a mid 80's chevy van tank in the 54 I used to have. It fit well and was 21 gallons if I remember correctly. Got the stocker behind the seat still in my 49. Once I got all the leaks fixed, (gas cap mostly) I'm really happy with it. I like the shut off valve under the cab. It still has some gunk in the tank, so I have a glass filter under there. When it gets gunk in it I just turn the valve off and clean the filter. Works for me.
