New Old Stock piston ring set Ford 254 c i Flathead 6 cylinder, 1948 - 1954 used in trucks.  For bore 3.500 at STD.  Ford part number 8MTH-6149-A.  This is an Steel Section Type Ring Set.

Note: we have one set this size with is labeled BOT-6149-AAA which replaces teh 8MTHS prefix,and has a chrome face top ring.