Alternative for the expensive Wilwood master cylinder.
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Plenty of Chinese master cylinders on ebay on ebay.Polaris Front Brake Master Cylinder For Polaris Trail Boss 325, 330, 2002 - 2013 | eBay
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The one I listed would fit a 2002 model,last year on the 325 engine Trail Boss,but yes the 2000 and 2001 models had the flared screw in fitting like you mentioned. This one should work.FOR POLARIS FRONT LEFT BRAKE MASTER CYLINDER 2000-2001 TRAIL BOSS 325 NEW | eBay A lot cheaper than an oem master cylinder.You can chunk the switch that comes with it.