Do not send us an email or note specifying what length chain you need. You must ORDER the correct length. BUYER must check chain length needed before ordering. Any info provided by seller regarding stock length is to the best of our knowledge, but seller is NOT responsible for chain that is ordered incorrectly. Any return for different length chain will be at buyer's expense, including shipping both ways. PLEASE check BEFORE ordering. This brand new 520 x 78 o-ring chain fits the following models 2003 Polaris Trail Boss 330 2004 Polaris Trail Boss 330 2005 Polaris Trail Boss 330 2006 Polaris Trail Boss 330 2007 Polaris Trail Boss 330 2008 Polaris Trail Boss 330 2009 Polaris Trail Boss 330 2010 Polaris Trail Boss 330 2011 Polaris Trail Boss 330 2012 Polaris Trail Boss 330 2013 Polaris Trail Boss 330 Included is a 520 x 78 o-ring chain blue 1 master link clip style Tensile strength of 8200 pounds Factory Spec brand This chain is the appropriate length for stock gearing, swingarms, etc. O-ring style means it will last longer with less maintenance than conventional chains