Diamond T Fuel Injection Control Module For 2004-2005 Chevy/GMC 6.6L Duramax LLY l5p duramax 2017+ set so you will need to

so you will need to buy two sets of headlight bulbs for each set of 2014-2018 GMC Sierra 1500 & Denali 1500 & 2014-2019 GMC Sierra 2500/3500 projector headlights you are upgrading the bulbs in assuming you want to upgrade both the low-beam and the high-beam

A common failure point on the L5P Duramax

universal ball mount that is highly adjustable

Fits 1996-1999 Chevrolet Silverado and GMC Sierra 1500 with 5

T4 flange thread is M10-1

Diamond T Fuel Injection Control Module For 2004-2005 Chevy/GMC 6.6L Duramax LLY l5p duramax 2017+ set so you will need toEnsure the reliable performance of your 2004 2005 Chevy GMC 6. 6L Duramax LLY with the Diamond T FICM. These Fuel Injection Control Modules (FICMs) are completely overhauled to a condition that surpasses OEM standards, making them capable of handling any truck modifications or upgrades you may have. With a 1 year warranty, you can trust in their durability and performance. The LLY Fuel Injection Control Module is known for being a common failure