The particular extenders can be added on any R&D alluminum backing plate in order to increase the crafts stability at high speeds. These sponsons extenders have tested extensively by R&D research team and additionally they were used under race conditions with positive results. They are made out of billet allouminum and are anodized to withstand corrosion. The R&D sponson extenders have the following part number Pt. #122-01802 and are already available from R&D.
