If anyones interested i've got a reproduction of the Mugen roll/harness bar in the part for sale forum.
check it out.
http://www.nsxprime.com/forum/showthread.php/175405-*rare*-arms-engineering-mugen-harness-bar
check it out.
http://www.nsxprime.com/forum/showthread.php/175405-*rare*-arms-engineering-mugen-harness-bar