Dodge daytona help needed.

We have a 1991 Daytona we are putting a new fuel tank into. My question is there are 4 holes in the tank, 1 is for filler neck, 2 is for fuel pump. 3 is for sending unit, 4 is on the top and we dont no what it is and we at least need the rubber gromat, can someone tell us what it is or have one to sell, thanks alot in advance. Local parts store dont have a clue.