Google "8 Pin DIN plug Canon". Include the plug genders: i.e. M-F, M-M, F-F based on the Carrier and Scanner ports.
Check the applicable Canon User Guides/Manuals. There may some accessories/contents list with part number for the cable.
Go to Canon's website to find the User Guides/Manuals if necessary. Look for parts and accessories via the Support category.
What gender on the plug ends? Include that in any generic searches.