Actually, the piece looks something like this.
They are not actually available at your typical Lowes/Home depot store, and it's impossible to find an online supplier (most just do bulk). Plus, it's metric (M5). Plus go figure if the 4 parameters (ID,OD, thread, lenght) will all fit!
I don't know about the previous year, but on the 2010, I swear that if you turn those screw (underneath the passenger handlebar) by over 1/2 turn after they barely bottom, the plastic will strip and you're done.
I figure that once the 450 kit is installed, the new handlebar metal frame wont come off until the end of the bike's life, so I may consider just gluing the 2 plastic cover together and forget about it.
Thanks anyway. If I find a part that fit, I'll update for the records.