I've fitted the "squishy" Kuryakyn grips to my FLSTN, and they work great.They came fitted with a paddle type lever on the end of the throttle twist grip that fits into the palm and assists when one blips or moves the throttle . My brother also has them fitted to his FLSTF (sans paddle) and we glued both sets on.
In all the years we've been riding,we have found by using a HAIR DRYER to heat glued-on grips that they come off easily,and are replaced just as easily.