The parts lookup shows "756-3032 Pulley, V-Idler, 3.06 OD" and like you said... NLA.
Forum member "FrankF3" claims IH-61176-C92 will work in this thread.
Stens # 280-188 V-Idler replaces Cub Cadet IH-61176-C92.
https://www.onlycubcadets.net/forum/...t=43450&page=4