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I just bought my first set of GM OE C5Z06 front pads (for my C6). I'm very surprised to see that the 2 inboard pads (with wear indicator) have different surface area: one is all flat and the other is tapered on the ends. The outboard pads are both all flat.
Never seen the Z06 pads tapered like that .... I'd take them back to where you got them from and demand a new set .... that's not right .... all 4 pads should be identical other than 2 have the wear tabs and 2 don't.