My 66 Belvedere had a new gas tank with it, but it was not installed. There was no tank strap or J bolt with the car. I ordered both of them, but I need to know how the tank plumbs up. The pipe that connects to the fender and goes down through the trunk is still connected. I have the curved pipe that connects from there, but I need to know if I need a 90 degree grommet type deal that connects the pipes or goes into the tank itself. The guy I bought the car from told me he had a 90 degree rubber grommet, where does that go? Do I need a straight grommet or what??? Please educate me on the plumbing of all this contraption stuff