The Bilstein M 7100 Classic Coilover (24-186520) is a high-performance reservoir shock absorber designed specifically for custom off-road racing applications and vehicles requiring precise suspension tuning. This shock features a 2.0-inch diameter body and a 5.90-inch stroke, providing exceptional damping control in a compact package. The nitrogen-charged monotube design ensures consistent performance and rapid heat dissipation during intense off-road use. It is fully rebuildable and re-valvable, allowing for specific adjustments to match vehicle weight and terrain. Component List (Service Parts Reference): - Shock Body Assembly: B4-BOA-0000109 - External Reservoir: Included with High-Pressure Hose - Rod Guide/Seal Assembly: 193088 - Piston/Valving Stack: Included (Standard Off-Road Valving) - Coilover Hardware Kit (Spring Seats/Lock Rings): Included - Spherical Bearings (Heim Joints): 1/2-inch ID (B4-BE5-6212-H1) Note: Coil springs are sold separately and are not included in this shock assembly.