I have a 2003, and I just went to Autozone. I don't know what kind of auto parts chains you have up there, but I'm almost certain you won't have to go to a dealer. You need a T45 bit for the bolt (depending on the year).

Shit dawg, Amazon will even hook you up: http://www.amazon.com/TAILGATE-CABLE-RANGER-93-05-truck/dp/B000CSR8SM

But that's pricey. Shop around; I think mine were about $7 apiece.