Supertech Performance Dual Valve Spring and Titanium Retainer Kit Fits Nissan 180SX - CA18, CA18DE, CA18DET Engines - 73lb. SPRK-TS1012/NCA - Supertech Dual Valve Springs - 73 lb Seat Pressure. Outer Spring - 27.50mm OD - 20.00mm ID. Inner Spring - 20.00mm OD - 15.20mm ID. 15.0mm Max Net Lift. Will Fit Nissan 180SX - CA18, CA18DE, CA18DET Engines. Complete set of 16 Dual Valve Springs, 16 Titanium Retainer's, and 16 Seats. This Package Includes: Supertech Performance Dual Valve Springs # SPR-TS1012/NCA, Supertech Retainer part #. RET-NVG1015/T1, and Seat part # SEAT-1015/2. ...