I have a set of brand new in the package Gizzom Thermal Intake Gaskets. They sell for about $70 new online. I would let them go for $45 shipped in the US.
Fits:
G6030's 1998 - 2007LEGACY2.5I; 2.5I LIMITED; 2.5I SPECIAL EDITION; BASE; GT; GT LIMITED; GT SPEC.B; LIMITED; OUTBACKH42.5N; TEJ251; EJ252; EJ253; EJ255; EJ25D; N/AGAS