This listing is for a Set of (8) MAHLE Original Pistons compatible replacements for 2008-2010 Ford 6.4L Powerstroke Diesel F250 F350 F450 F550 Pistons & Pins in +.030" over bore or .75mm over size.The Bore size will be 3.896 diameter. Pistons Only, Rings not included! These apply to VIN R 32-V Engines. VIN Refers to the 8th digit in the vehicles ID number in lower Driver side dash. This listing includes pistons, piston pins and piston pin clips (locks). Note: Ordering this item will require a signature confirmation upon delivery. Please ship to an address where a signature can be obtained from UPS.