Sealey RPS1BS Bobbin Supports for RPS2 Optional Bobbin Support for Model No. RPS2. Designed to give extra support and added stability once rear axle has been located and raised. Yellow phosphate finish for added corrosion resistance. Optional Bobbin Support for Model No RPS2 Designed to give extra support and added stability once rear axle has been located and raised Yellow phosphate finish for added corrosion resistance Model No RPS1BS