if you have some extra cyls for parts & them & the ones you are working with currently have the chrome rectangular covers you can mix/match tumblers/spacers so all of the locks can be opened with the same key even to where one set of keys opens ALL of your vehicles!. the tabs on the chrome covers are brittle so be careful with them. bend em just enough to get the cover off. if you are lacking parts you can have 2 holes operational instead of all 5 (nobody picks locks anymore except in the movies). with the key inserted you mix/match tumblers/spacers so the final height is the same (not too tall not too short) so the cyl can turn.