Debonair Shafts for repair and maintenance of Rockshox SID and SID SL suspension forks. MPN: 11.4018.111.035 - RockShox - SID / SID SL Debonair Air Shaft - Air Springs & Parts. We are out East at 3063 Columbia Ave. - Lancaster PA, 17603 & out West at 3225 Grande Vista Dr. - Newbury Park, CA 91320 & 165 Design Place, #105 - Sparks, NV, 89441.