GM/ACDelco part number 15699959. Gasket. Need 2 per car. Says they come in a pack of 10, however if you have to order them from a dealer if they don't want to sell you just 2.
If you have any issues just getting the 2 you need, hit me up. I know I have a couple baggies of those beeches around here.
Current list price $1.42. Likely to get them for buck and a quarter each if you can get a discount. Technically you don't absolutely need it, but the gasket is part of the defense against water intrusion to the rotors/spindles. You could probably make a silcon bead out of some sealer to do the same thing, only it's probably messier, and probably a PITA to take off.
If you really want to buy 10, O'reilly's Auto Parts sells them for 1.14 each, but you need to buy the whole package of 10.
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