Hi James,
i don't know the answer directly, but i would suggest asking a cable specialist store.
here is a web address the type of place i'm talking about (as found on google, no association!)
http://www.4cabling.com.authere's a chance that the cable is caled something else in the real world.
EG: i was asking around about a MADI cable for my SSL converters, and after about 10 phone calls i decided to look on the SSL site to see if they offer a replacment. i found the answer in their FAQ section.
turns out that the cable i was after was caled a multimode fibre cable, which only cost me $30 (i'm sure if it had Digidesignwritten on it, it'd cost twice the price!) and i had a single mode one which was my problem....
if you have a cable shop local to you, i'd suggest taking and example of the Digilink cable to them, see what they suggest.
good luck mate!