Guzziology has a chapter that has pages of tables with information about cable lengths and end fittings, with part numbers and which motorcycles they came on. It allows you to find a cable that will work for your application, and get the part number for it. I was able to use that information to get a shorter clutch cable for my Mille that works much better with my "superbike" bars than the stock one did, without having to get one custom made.