If money is no problem then here's an option for you.
http://www.powerplayimports.com.au
Speak to tosh, or jo. Tosh is on the forums here SW20GT or something.
East Bear in Japan make a replica GTR front bar for the GTST. It is two piece just like the real thing, and is also plastic!! Not cheap-arse fibreglass, IIRC.
East Bear fit is perfect too. I have one of their bonnets, I put it on without any adjustment or modification. Straight on, perfect fit.
But you'll be paying > $1000 for the GTR-style front bar, unpainted. Looks just like the real thing btw. First time I saw one I asked the guy how the hell he fit a genuine one on there. I was shocked when he said, "it isn't...It's East Bear"