21 Sport Hydro Round Bottom Strut Assy. PDF Print $25.50 SKU: SPDS-005-R 21 Sport Hydro Round Bottom Strut Assy. SPDS-005-R Add to Wishlist Add to Compare Back to: Speedmaster & Miscellaneous Hardware Description 21 Sport Hydro Round Bottom Strut Assy.SPDS-005-R