Yep. You'd be best off to join the SAU NSW club (hint, hint) so you can receive trade/club discounts and you'll also know who to talk to at which Nissan. Otherwise, you'll no doubt have some older guy who wants your VIN and then tells you that VIN doesn't exist and you can't have parts, then tell you the Skyline parts aren't made anymore, etc.
Talk to the right guy and you'll have a genuine front bar in two weeks.
Oh yeah, 180_mph touched on a good point, you'll need a GTR front reinforcement bar or you'll have to cut up your GTSt one. I'd go to a wreckers or SAU for sale to find a used front reo bar.