4380 x 1. SPAX  XK140 & XK150 Front Shock Absorber: A Superior Gas Filled Multi-Adjustable UK made, high quality unit. This unit has 28 position adjustment via a thumbscrew at the base, so it may be tuned for prefered rebound, while still on the vehicle. Original Oil Filled Unit Ref. Number C8007

NOTE: Remember, setting these shocks to the firmest settings could lead to XK chassis damage under harsh use, unless you reinforce your chassis, beforehand,  to accomodate this style of use.