Description Polaris Quad Bar Replacement Rails These Clevis Rails are designed as Polaris Quad Bar replacement rails (models 4006, 4006M, 4008, and 4008M). Available in 6-foot and 8-foot lengths, these rails are sold individually. Item Numbers: [CLEVIS-6] – 6′ Rail [CLEVIS-8] – 8′ Rail Rail Assembly and Installation Instructions Find the Polaris Quad Bar System here. Browse more of our high quality Spieth America products here.