Traxxas Spring Retainers, Upper & Lower (2 Pcs) / Spring Pre-Load Spacers: 1Mm (4 Pcs) / 1.5Mm (2 Pcs) / 2Mm (2 Pcs) / 4Mm (2 Pcs) / 8Mm (2 Pcs) (Big Bore Shocks) (TRX2668)