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Z Whip Stainless Steel ECM Mounting Brackets for LS Series GEN 3 Engine Computers used on 5.7L, 4.8L, 5.3L, and 6.0L LS Engine Swaps. (Vortec 99-06/07 Chevy Gm Trucks 1500 2500 Sierra Silverado and 00-06/07 Tahoe Yukon Suburban Express Avalanche). Proudly Made in the USA with USA Made 14gauge Stainless-Steel Sheet these will not rust or corrode. Has Some light scratches from the manufacturing process if wanted, you can paint or polish these to match your engine bay. CNC Laser Cut and Cnc Brake Press for Maximum accuracy. Comes with 4ea SS Bolts. Does NOT come with ECM in Pictures. (Reference only make sure your ECM is the same style)