remove the old reg plate, remove the pull handle and unclip the wiring for the lights, plug the holes, cut the new square plate and fit then measure out for the 3 holes (2 srcew and 1 for the bulb) per nipple and drill them out, then splice them into the wiring that was originally used, make sure you find out which is which first lol
and squarepants they are k10 ones 
