Springs
Every spring on this page is a snowmobile suspension spring. The bulk of the selection is SPI rear suspension springs in the SM-043xx series, which replace the torsion springs on the rear arm of the skid frame; the rest are Kimpex slide and bogey suspension springs for older slide-rail and bogey-wheel skids, an SPI spring-holder repair kit for Ski-Doo, and an SPI coil spring for a Polaris gas shock.
Match the number, then check the hand. SPI rear springs are sold as left (L) and right (R) parts because the two sides are wound in opposite directions — an SM-04355L and an SM-04355R are a pair, not two of the same spring. Find the OEM number in your sled's parts diagram and compare it with the cross-reference on the product page; if one side is sagging or broken, replace both so the sled sits level.
Signs you need one. A rear end that sags under the rider, bottoms out on small bumps, or lifts the skis under throttle usually means the torsion springs have lost their preload, not that the shock has failed. Check the springs before buying a shock.
Shock coil springs. For the Polaris shock spring, compare free length and inside diameter with the spring you remove; both are listed on the product page.
While the skid is out. Inspect the rear arm and rail bearings, the linkage pivots and the slide rails; many of these parts are in Snow Accessories and Skis.
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