Bolt on Extensions

Does anyone know where to get bolt on extensions? I need some for a 2003 kx 250. Anyone know people who do this? I've heard mainly only milling workers can do it. I have searched the net but am only finding stupid street bike swing arms
 
too bad they dont still have the square ends on the swingarms where it was easy to make your own. you need a spare swingarm and a welding shop that is into either stretching one or building them. some of the plates the sled riders use to extend tracks look like they could be a start if you want to build your own boltups. Should work for hill climbing.
 
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