Spider Racing Clip-On Handlebar Kit for RS660
These clip-ons are required if you're planning on running the Spider Racing Top Clamp
CNC machined from 7075 Billet Aluminum
Spider describes these clip-ons as 25mm offset (see attached image), but that 25mm offset (viewed from above) is pretty typical and about the same dimension as the stock RS660 bars. Of perhaps greater importance is that the bars sit some 40mm (1.5 inches) lower than the stock bars. This could result in reduced steering clearance with stock bodywork.
Also note, these clip-ons are not pre-drilled for the locator pins found on the RH and LH switch groups. You will need to drill at least 2 4mm holes in these clip-ons when you install them.