honestly, dunno if i would trust hardware store fittings for a harness bar. if you forget about porsche-specific gear and go to a racing site like summit racing and search 'harness bar' you'll see that they have a bunch of generic options that might work for you.
otherwise, what kind of seats are you running? i ask as i've been using the factory roll bar with gt3 seats for my harness and, while the geometry isn't perfect, it ain't the worst.
the little loops are for a cargo net.
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