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Solid Billet rail extensions for Polaris. Kit uses factor windows to help brace as well as raising the rear axle to allow for 8" wheels. The rail extension alone is $160 and I'm including two 8" wheels and an axle kit. I used this for a 144 to 156" track length, would probably work for other track lengths.
http://bozeman.craigslist.org/snw/5417570722.html
http://bozeman.craigslist.org/snw/5417570722.html