GM 2771004 Hydroboost Repair Kit (Exact Duplicate) Complete Seal Kit. Hydro-Boost Complete Seal & Component Rebuild Kit – Replaces Bendix 2771004 (Kit 501). 1964-1972 GM A Body (Chevelle). Duramax Diesel Hydro-Boost Repair Kit (Mostly Rubber) Hydra Boost Seal Repair.
