+3 CAT Fuel Filter Head Spacer for 6.6l Duramax 2001-2016 KB-6.6l-FHS $15.95 In stock Quantity: 1 Add to Bag Product Details Filter Head Spacer & Bolts Must be used on 2011+ with the CAT Adapter or if the 1R-0749 CAT filter is used. Spaces the fuel filter housing away from the engine Makes filter removal & installation much easier Fits: 2001-2016 Chevy/GMC 6.6l Duramax LB7/LLY/LBZ/LMM/LML Save this product for later Favorite