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I've just noticed your message so apologies for being very late in replying. I'm not sure where you could buy the RS bonnet support - perhaps you could try Porsche, they might still be available.
Alternatively, it looks like something that can be very easily fabricated. I would be happy to take some photos and a few measurements if you can find someone who could make one for you. You'd also need to change the 'bottom right' strut bolt to an allen (hex) headed one to accept the point of the strut when the bonnet is open.
You 3.8 963 sound interesting. Are you based in the US or UK?