Some silicone spray and a long skinny screwdriver or awl should loosen the hold the existing grips have, or just slice them off with a sharp knife. Roll back the rubber on the right grip near the mounting hardware to see what holds the right grip in place.
You may need to glue the left Kuryakyn on. The right side may not need glue. You'll see.
The plastic throttle sleeve is a might dainty, and doesn't like forces applied to it (ie: large hammer type implements) outside the realm of it's intended throttle on / throttle off duties.
