These gaskets are to be replaced any time you remove the throttle body. The gaskets are available in both drive by cable and drive by wire, please choose accordingly.
Throttle Body Drive By Cable Gasket (02-05 WRX)
Part # Gasket-020009
Throttle Body Drive By Wire Gasket (04-11 STI,05-09 LGT, & 06-11 WRX)
Part # Gasket-020010