Fuel Rail Assembly: GM 12651989 / BOSCH F00RL01027. - Manufactured by BOSCH (OEM) for 2011–2016 6.6L LML Duramax. 2011–2016 Chevrolet Silverado 2500HD / 3500HD (6.6L LML Duramax Diesel). 2011–2016 GMC Sierra 2500HD / 3500HD (6.6L LML Duramax Diesel).