Gary if your intention is to remove the car cigarette lighter power lead from Garmin car cradle and attach to the RAM-HOL-GA15 crade then it will fit, again use single torx screw underneath the cradle. Then use an inline power socket to the supply. One concern is that the car charger units Vreg was limited in Vtemp (50 deg C for car, bike was higher rated 125 deg C) which is what QPAC and Garmin bike charger cradles used.