This Koni rear shock for Dodge Promaster torsion rear applications is listed with an LMax of 420mm. It is a twin-tube hydraulic unit that is not adjustable, intended as a direct replacement where the 420mm maximum length is specified. The overview reflects the product description's emphasis on the stated LMax dimension and conventional twin-tube hydraulic design.
Koni Dodge Promaster Torsion Rear Shock - LMax 420mm