yeah on the column with intermittent wipers. You can pick one up at Autozone or O'Reilly's. They are in their "HELP" section, where you find all the window cranks and what-nots for your cars.
The black ones like these are run about $30. I needed a chrome one that was exactly like it, just chrome...they run about $60-$90 depending where you get it. I didn't want to spend $60 not knowing if that would fix the problem, so I bought the cheaper "HELP" version, seen that it would work, and returned it and got my money back.
In your case, buy it, hook it up (don't install it in the column yet, just hook up the harness under the dash)...take it down the road and hit the cruise. If it works, install it in the column. On the trucks with the column mounted switch, I would say 9 times out of 10 the problem is teh switch.
If it doesn't work, take the switch back and get your money back, then look for another problem.
Not sure what the c-10 one even looks like, so you're on your own there /forums/images/graemlins/crazy.gif
Also, after I bought my new chrome switch, I noticed it looks like yuo can take a couple of real small "c" clips off of the levers, and take the chrome pieces off and swap them onto the new cheaper black lever.