Hello, I just installed a set of edelbrock headers on my 2000 5.3. In their installation instructions it said you reuse the pass side donut gasket. The problem is the edelbrock pass side header flange has a 2 3/8 dia hole and the factory is 2.5 and the factory gasket will not slip into the header. Has anyone run into this? and if so what gasket did you use? I went to three part stores today to find one that worked and they had nothing. Thanks in advance, James