Piston Set, NOS Ford, for Flathead Ford V8 3 ring for bores 3.1875" with 3 3/4" stroke; can be used in 1949-53 with 3 3/4" stroke and standard bores as well.  These are compete with piston pins, locks, and rings, in WWII military packaging.  Ford part number C09A-6198-A, piston casting number O9A-6110-A