You need a race seat ............
As for the harness bar, that it what they cost ........... do not under any circumstances use the decorative bar in the car between the rear suspension shock towers .... as a harness bar.
I had one made and it cost me A$450 - you could try to get one from Australia (search site: the370z.com+BGTV8+Harness+Bar via Google to find the details, but I am not sure how much freight you will be up for to get it to the US - at least A$150). That might be a cheaper option. A$ is only worth about US$0.75 at present
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