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Happy New Year Matt and All,
Matt, Dave’s advice for locating the cylinder block stamped serial number is well taken. As you comment, the Fairbanks-Morse XV4B70F is indeed the original magneto, then you likely do have a Mark 30 or Mark 30E, or first serial grouping produced as a 1956 model. The “E” denotes an Electric model with electric starting and battery charging system. As to the oil seal part numbers, the 26-25837 and 26-25840 have indeed been superseded, but we strongly prefer the use of Viton lipped seals which we offer (@ 7.39 each) for use with ethanol gasoline. The remaining three part numbers have not superseded, but two are very long ago discontinued. As advised, with legwork substitutes may can be located at a bearing supplier. We do try to stock all of them, however, but I would check the outside diameter of the shift shaft bushing oil seal before ordering a replacement because the bushings were produced using either of two possible outside diameter and depth seals, and the parts manual may advise incorrectly when choosing.
Regards,
Joe
(770) 597-5992