I had the honor of checking out and riding a custom Rickman framed Xl125 with Rickman plastics, seat, and tank.  I am not complete sure about the brands of the parts, but about the only thing on the bike that was stock was the carb and engine.  I'm not sure if the engine had any mods made to it.  The only after-market part that I was sure of were the ceriani front forks, and damn did they ride good.  The geometry of the frame felt like a moder MXer.  If any of you old heads recognize the rear suspension or the hubs,  let me know, I would love to know the manufacturers.  Note the adjuster which pushes the swingarm back to change the chain slack.
   
Adam