Yes, the Curt trailer wiring harness # C55593 is a confirmed fit a 2008 Mazda CX-7 that came with a factory installed towing package. If you are not sure if your CX-7 has a factory tow package, then have a dealer run the vehicle VIN and they should be able to tell you how it is equipped.
The Curt harness is actually rated for a little more power draw at 6 amps for running lights and 3 amps for brake/turn signals per side. The Tow Ready harness is rated for 5 amps and 2.1 amps, respectively.
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