You can use these
RhinoMoto mounts if you want to keep them weighted, or you can use the
CRG adapters and cut off an appropriate amount of the wedge portion if you want something a little smaller. I just did mounted the CRGs and while I like the low-profile look, I'll confess that I'm feeling a little more vibration than I'd like and will probably switch to the RhinoMoto mounts. If you go the CRG route, don't assume that the depth for the welded/glued bosses are the same on both sides. . . mine weren't. Measure them individually before you cut.
If you go the RhinoMoto route, they said that if you use the Gen 2 version without the "dress ring" it will be 5-6mm narrower on each side then if you used them.
@Dan00Hawk posted about the RhinoMoto mounts awhile back.