when I colour coded my 600 i fitted the lock barrel into the new handel so i still have one key for all.
The first handle i got had the barrel pushed in which i didn't notice had snapped the plastic where a U clip holes the barrel in but the barrel was ok. So you probably only need another door handle.
Best bet is to take the door trim off and have a look.
I have also taken the barrel out of the lock before and swapped all the sliding pins and springs over. Very tidious 15 minute job but it did work.
The first handle i got had the barrel pushed in which i didn't notice had snapped the plastic where a U clip holes the barrel in but the barrel was ok. So you probably only need another door handle.
Best bet is to take the door trim off and have a look.
I have also taken the barrel out of the lock before and swapped all the sliding pins and springs over. Very tidious 15 minute job but it did work.