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If it is the Trans am pedestool style I can send pics / dimensions on mine. If it is the Camaro lip style then I can't really help. I didn't think Pontiac offered one in 67
If there are threaded studs on the bottom of the spoiler, take a piece of cardboard (or tape pieces together) that will cover the bottom of the spoiler. Press the cardboard into the studs, and you'll have yourself a pattern.
If there are threaded studs on the bottom of the spoiler, take a piece of cardboard (or tape pieces together) that will cover the bottom of the spoiler. Press the cardboard into the studs, and you'll have yourself a pattern.