Try these guys:
http://www.inlinetube.com/Brake%20Ca...s/bcables7.htm
I coundn't find any for my 62 k-20 either. The 2wd cables have outer cables that are too short. I bought a set of 2wd cables and made outer cables out of bx cable sheathing and hard palstic air tubing. I cut off the ends and used screw on threaded adapters from Harbor Freight. They work ok - not perfect, but got me through inspection.
There is another company that makes cut to fit cables - I can't find that site right now.