The Fleece FPE-TL-LB7-LLY Allison Transmission Cooler Lines fix the old leaky transmission lines in your 01-05 GM 6.6L Duramax LB7 & LLY. 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(6) 7/8"-14 O-Ring - 10AN Fittings (2) 3/4"-16 O-Ring - 10AN Fittings (4) Black Zip Ties (2) Concave Washers Note: Trucks with aftermarket radiators will require the purchase of Fleece FPE-TL-ST Setrab Fittings to install transmission cooler lines.