im not 100%, but on my first r33, which was a s1 gtst, i think my insurance company paid around 500 for the 400r front bar...and i think it was from jetspeed.
thing is, the ones they supply, r copies. they have a mould and they just keep reeling em off. they r perfect, nothing wrong with them or anything, but as each mould is made, the bar size slighty increases. that doesnt really matter though, cos the panel beaters spent a day prepping it so that it would fit perfect..after all, thats their jobs...