try this website on for size. It has just about everything you would ever want to do with a standard indy chassis. www.off-road.com/snowmobile/project/indy/xtra10.html
If you have a evolved chassis you can put an extra-10 in it as well. for example 94 and 96 evolved chassis use the same front end but the rear suspensions were xc-100 on the 94 and xtra-10 on the 96. just follow the guidelines in the website.
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