- Black spring - Clear body - Piston diameter: 36mm - S: Single tube body - E: Emulsion type shock absorber - Length: 311 mm - Stroke: 79 mm - Rate N/mm: 26 N/mm - Position: rear - Mounted spring: 66420-026 - Packaging unit: pair - Not ABE approved. These STX36's are designed to replace the dual shock absorbers on Touring models for comfort and improved rideability of your bagger.