Upgrade your Cat 259D and 259B3 series rubber tracks to the premium aftermarket rubber tracks from Rubbertrax and increase lifespan and performance from your undercarriage. We now supply the undercarriage parts including the drive sprocket (304-1870), the front idler (304-1878), and the rear idler (304-1894). We are also stocking optional rubber track tread patterns and track width options. Cat 259D parts can vary depending on your setup you may have a dual flange idler assembly or a triple flange front idler assembly so please very your exact idler prior to ordering online. Other than the idlers, the Cat 259 undercarriage parts specifications are direct replacement and guaranteed fit. Please see each part listing for details.