Ariens 910019 Tec H60 and the belt is spec'd at 3/8 x 35.5 OEM #72047 - So I have since found out. I purchased a Stens off a reputable site supplier and there were two choices but neither listed the measurements. The one I ordered is actually 3/8 x 36" Stens # 238-036. States it is also a replacement for that OEM.
Found perusing the web on this question:
"What he said but I'll add that Stens also says you can use a 3/8 x 36. Since Ariens owns Stens I would assume that this info is correct."
Anyone tried or used a 36" belt??? Or should I just return it or eat the $13 and get the right one and be safe? Thnx.