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find a bare metal surface (under the carpet) if there is a bolt it usually helps, then sand away the paint and bolt on the ring terminal ! if there is no bolt drill a hole and bolt on the ring terminal yourself !
Rear seat belt mounts are usually a god place to go for, just make sure earth cable is less than 1M long this helps with sound quility and reduces the chance of the amp clipping or triping out!
But as cars get older the body earth point to battery gets worse electrically, so you might be better running an earth straight though, or going round checking the body earth connection to make sure of damn good contact, you dont want to be let down by a bad earth