Original OEM Side Replacement arms for your Wilson Sleek Cell Phone Booster / Cradle Amplifier. Part number 991183.Broke the arms on your cradle? Prefer a different size than the one that came with your amp? Or, would just like to keep some spares around?Fits the Wilson Sleek Cradle Amplifier 815225 (identical to the cradle that ships in the 815226 kit)