Hy Achipmunk and guys, I think your flywheel might be p/n 3705387, 42 - 53 heavy duty clutch, 9 holes, supposed to be stamped "2UC". In hoyt's posting of 01/03/09 there is a link to the parts manual, the descriptions include casting numbers, the casting number you quoted is not listed there, so this is a total surmise on my part, using the facts provided, hope that helps.
