You can pretty much ground the Amp to any part of the car's bodywork. If you have a decent ground circuit in the car, then the bodywork will be earthed.
So, look for a bolt that's fitted into the bodywork - usually something like a seatbelt harness or light fitting etc. Then unscrew it, scratch away the paint to ensure a clean contact with bare metal, and earth the amp. Best to use a crimped connector on the earth wire for a solid connection.
Hope this helps...
Jon.....
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