YOU CAN NOT USE SECOND HAND CLOCK SET'S ONLY NEW ONE'S AS THE IMMOBILIZER CODE IS PROGRAMMED INTO IT AND THEY ARE NOT RE-PROGRAMMABLE, PLUS YOU CAN'T USE CLOCK SETS FROM 2001 ONWARDS IN A PRE 2001 CAR AS THEY USE A DIFFERENT AMOUNT OF CODES. SO IN OTHER WORDS IF YOU WANT TO CHANGE YOUR CLOCKS YOU HAVE TO BUY NEW AND YOURS WOULD HAVE TO BE PRE 2001 SPEC.