For a Superbike Handlebar you could call:
Fabbris Moto S.n.c.
Via Don Gregorio Segala 42
37139 Verona
Tel. +39 045 8902408
e-mail:
info@fabbrismoto.com
website:
www.fabbrismoto.com
They are italian buisness partner of a company called LSL.
LSL produces the nessassary clamps to fit a superbike handlebar on the GS-500.
Alternative you could call LSL directly and ask them to speak english.
+49 2151/5559 0