Just replaced mine yesterday. Was able to get both the up and down pipe doughnut gaskets special ordered from autozone. Part number for the up pipe is felpro 60537 ($19.49) and downpipe is felpro 60755 ($9.49). Went to the store at 4 monday to pay for them (around $30 for both) and had them tuesday in store at noon
The up pipe gasket 60537 replaces the factory flanged cone shaped adapter