Honestly, I'd just use the stamped ones for the tiller and keep an eye on them. For someone like me that tills a garden at the beginning and end of each season, and uses a walk-behind (much narrower rows after stuff is planted) the stamped ones will last quite awhile. My previous tiller tractor, a 128, had the billet pulleys, but I had a really hard time finding them, and they were expensive.
And for the snowthrower, as long as it isn't die-cast aluminum, it should be fine. The OEM tiller pulley on the 2B tiller is stamped steel with a CI hub...
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