If you get some genuine or replica roof bars like in the links, they will need to be cut down a fair bit to fit the top of a KC.
There's a couple of things to bear in mind:
The roof bars are curved to take up the shape of the roof, as you need to cut the length a fair bit, this may make the seating of the bars a bit difficult?, i have straight stainless bars on my truck, they're very slightly smaller diameter than the originals, so this helped when getting them lined up and seated.
The other thing to consider is, you will need to drill 16 holes on the roof, these holes will need riv-nuts fitting to take the mount bolts. This is easy enough to do, but there is a risk of the roof leaking, and some people have drilled through the roof linning
If you take your time though, i'm sure it would be fine, but just things to consider