Hello I have a 1954 chevy 3100 have question about the gas tank. Were the filler tube and the vent tube go into the tank there are 2 bolt's .Is there a gasket under that flange ? Reason being having tanked cooked out at raditaor shop.and need to know if I will need to replace gasket or Oring or what THANK YOU for any help or advice thanks again!!!!