2007-2008 Polaris IQ Snowmobiles Service Manual, Page 206Get this manual
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Steering and Suspensions Adjustable Shocks
Rear Suspension Type by Model
IQ 121 IQ 144155163 M-10 128 M-10 136 IQ 136 Coupled IQ 136 Comfort
20072008 IQ 121 Models 2007