Robem Engineering upper triple clamp for the Aprilia RS457.  
 
Offset that works with remaining stock front end components while allowing you to have the flexibility to fit clip-ons for both street and track use.   The drop of the stock triple is decreased to sit flush with the top of the forks to gain clearance needed for clip-ons.
 
Stock steering lock is retained to keep you worry-free when away from your bike.
 
As always you have the option of titanium hardware or the more budget-friendly stainless.