The Fleece FPE-TL-LBZ-LMM Allison Transmission Cooler Lines fix the old leaky transmission lines in your 2006-2010 GM 6.6L Duramax LBZ & LMM. These heavy-duty, high-flow, flexible transmission lines are just what you need for trouble-free performance from your Allison Transmission. KIT INCLUDES:Transmission Lines Concave Washers(6) 7/8"-14 O-Ring - 10AN FittingsNote: Trucks with aftermarket radiators will require the purchase of Fleece FPE-TL-ST Setrab Fittings to install transmission cooler lines.