My recent Blitz kart purchased

[Jim Waltz]

http://www.matcomfg.com/NOSEWHEELASSEMBLIES-tp2-6.html
will at least get you into the Matco site in the right area. You still must be careful to pick the right size, width and bearing diameter/type you need. Their prices are decent, and their sales associates helpful. Just don't expect them to be able to tell you which wheel to buy for karts!
BTW, nice looking set of wheels, Jim! Ted

The wheels do make a nice appearance, though they are not "show" quality.  There's some pitting on some surfaces below the paint, and some minor hammer marks, which you can see in the photos.  A good set for a runner, I believe, ready to bolt on and drive.