These are the Bilstein 5100 rear shocks from the RCD 4"-5" Tacoma Lift System. Also used in their '99-'06 Tundra 6" Lift System.
Bilstein 5100 Series Shock Absorbers are high pressure gas monotube shocks designed specifically for lifted pickups and, SUVs. The shocks feature a 46mm digressive piston with self-adjusting deflective disc valving. Offering super damping ability that makes them ideal for heavy hauling or occasional off-road use, while maintaining an exceptional street ride.
– They measure 16.34" X 27.28".
– RCD pairs these with a 4" rear block.