Yes Phil Wood makes one. Surly makes a converter for rear track hubs. White Industries makes the Eric's Eccentric Eno fixed gear hub. A UK compamy called Goldtech also makes one. Suzue's basic track hubs axles are long enough if you use spacers. Van Dessel also has the hubs you are looking for. However you may be able to replace your existing axles with longer ones to run the desired setup.