The have an adhesive layer on them, you just peel off the backing and push onto the body work. Make sure that they are warm before application, in the cold the plastic can snap easy. quick go over with a hair dryer or leave inside to last minute
Apologies for resurrecting an old thread: but all the details in here are really useful...! I know Ziggy122 is planning on adding DRLs to his Mk2b... -- and I'm sure this will come in handy when/if I do the same to my Mk2.