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Sorry, they may not be covers, I've just never looked at the closely other than to know that they've been gouged.
I've circled the piece I'm talking about from an Infiniti pic:
OP I am guessing you have a non-sports g37? That is a picture of a sports calipers.
You can get a set new for $1400( for 4 calipers, lines, pads, and rotors)