RockTrix - 4pc 1.5" Thick Wheel Spacers - 8x170 Bolt Pattern with 14x2 Studs (Coarse Threads) for 1999-2005 Ford Excursion, 1999-2004 Ford F-250 Super Duty F-350 Super Duty [FORD FITMENT] Vehicle Must Have 14x2 (Coarse) Wheel Studs. 1999-2005 Excursion. 1999-2004 F250, F250 Super Duty, F350, F350 Super Duty. [IMPORTANT FITMENT INFORMATION] 1) Measure wheel gap for clearance. You will need at least 1.5" (38mm) of fender clearance to prevent the wheel/tire from hitting the fenderliner. 2) Measure your vehicle's wheel studs. It must be less than 1.5" (38mm). 3) Check the thread size of your vehicle's wheel studs. It must be 14x2. [SPECIFICATIONS] Set of 4. 1.5" (38mm) Thickness | 8x170 Bolt Pattern | 125mm Hub Bore | 14x2 Threaded Studs/Nuts [MANUFACTURING] CNC Machined to exact specifications from Aerospace Billet Aluminum. Undergoes anodizing process to prevent corrision. Includes pre-installed heat treated 10.9 grade studs. [PRODUCT BENEFITS] Gives your vehicle a more aggressive stance. Improves handling characteristics and stability. Fixes brake caliper clearance issues. Increases tire clearance to allow installation of wider wheels and tires.