BEL521 / 521 - Application Notes 97-00 C3500 Standard / Extended Cab / Dually - (4-5”, 4”) 97-00 C2500 Extended / Crew Cab - SRW 8-Lug - (4-5”, 4”) Notes: - Not designed for diesel applications. - For increased suspension travel use #6911 C-Section Frame Kit. - For trucks w/o O.E. front sway bar order adapter kit #5700. - It is highly recommended to use an AirJack