Clubman Bars on CB550 ?

I am going to put clubman bars on my Honda 1976 CB550K Four.Need to know if I can use the cable already on the bike or do I need too get a shorter set.Also if anyone has any pics on the whole process.I want to also run the electical wiring the way the original was set up and I know it involves drilling some new wire holes.You can post on this site or email [email protected]