This is the complete L/H wheel arch but you can purchase the top part only as
14A6617 for R/H or
14A6618 for the L/H
Also available is the shock absorber turret part separately,
HMP441010 RH and
HMP441011 L/H-- These complete arches are used on vans but require a small amount of body modification as they are slightly bigger--on the plus side it does mean you can fit other types of dampers that would not normally fit the van turret on the arch--original van arches are now obsolete