this set matches the 4.25od x 3.50id x .375cs dimensions required to ensure the proper fit. subject nsn should be procured as a set consisting of part numbers 461737503500vf, 461737503500vm & 461737503500vp.
2.248" inside diameter 2.223" center hole diameter intermediate ring is 987 nitril cmp, 65 duro shore a; internally molded in back up ring is non radiused, reverse scarf angle wear resistant nylon per gts-0020