This plate is used to blank off the Mk2-on rectangular tail lamp hole so an Mk1 lamp can be mounted in its place. Go retro! Sold each; choose right- or left-hand side. Note: welding required. Ref: MS026L, MS026R, SBO0704, SBO0703, 13H222.
See also 53797 (left hand) and 53798 (right hand) lamp assemblies.