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If you have to ever replace them you'll find they cost around $75 for the set. There are good aftermarket ones (Fel-Pro) which cost only $20something, but after removing the intake, the aftermarket ones twist around and won't stay flat in the grooves to re-install. They are one time use. You end up needing another set.
Which is okay, since they are so much cheaper than GM. I'm only saying because you shouldn't remove your (terrific) factory ones unless they become damaged somehow.