Hummer Headquarters! Lynch Hummer sold more Pre-owned Hummer H1, more New H1 Hummers, more certified used Hummers and more AM General Hummer H1 parts than anyone in the World! Jim Lynch was the only Hummer Dealer whose ONLY business was Hummers. We are no longer affiliated with GM but we are still an authorized parts center for AM General, manufacturer of the Hummer H1 and H2. With the closing of the Hummer brand, General Motors will not allow us to use our Lynch Hummer name, so the name has changed but the passion for Hummer remains the same!