Although the Thule Passage is a fit for the 2009 Pontiac G5, but this trunk mount rack could damage your spoiler. Thule has another option for your G5 Coupe that works with spoilers, the Thule OutWay # TH45JV.
Another option would be to go with a hitch and a hitch mounted bike rack. I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # C11447, which is a confirmed fit for your Coupe, and the Swagman 2 bike rack, part # S63360. view full answer...
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