These lifters fit 2007-2014 GM Engines with the AFM/DOD Systems. 

1 Single Active Fuel Management AFM/ DOD Roller Lifter and AFM Lifter filter for 2007-2013 GM 5.3L and 6.0L with Active Fuel Management. 

AFM Lifter failures in GM engines are the result of another problem in the engine. They are not the cause of the failure. That problem needs to be resolved as part of the repair or repeated lifter failures will occur. Please read the tech bulletin in images and watch the videos in the links below:
Click here for the video from Melling 
Click here for a video from GM

In an effort to reduce the occurrence of "Porch Piracy", please consider changing your shipping address to a commercial address if no one is at home for delivery. The shipping companies are not responsible for missing shipments once an item is marked "delivered". Thank you.