I have noticed many people asking for part numbers lately , I know that the FAQ has it but I also did some searching on ebay and came up with complete parts lists that you can have at your finger tips at home.
http://cgi.ebay.com/ebaymotors/PARTS-LISTS-Cadillac-CTS-2003_W0QQcmdZViewItemQQcategoryZ6762QQitemZ8029010832QQrdZ1
This is just one , but I have seen many in the past . I also bought a CD version for my Jeep and it has been a lifesaver a few times. Hope this helps.
http://cgi.ebay.com/ebaymotors/PARTS-LISTS-Cadillac-CTS-2003_W0QQcmdZViewItemQQcategoryZ6762QQitemZ8029010832QQrdZ1
This is just one , but I have seen many in the past . I also bought a CD version for my Jeep and it has been a lifesaver a few times. Hope this helps.