I am trying to replace the fuel pump on my 99 chevy blazer LS 4x4 four door. My question is does anyone know what size the original locker ring is? I have ordered a part from advanced auto, summit racing and another local shop. The ring that i keep getting is not large enough for the tank. I am 99% sure that the tank is original, the old ring was rusted and chunks broke off when i removed it, and now you can see into the gas tank.