You can use a QA36A or QA42A with a 5/8" pulley on the input shaft. The QA42B is meant for the 82 series tractors, so it already has the 5/8" pulley. I don't think there is a QA36B, but if there is, same deal as the previous one. In my opinion, when these were configured for use on an 82 series, it was a bit of an afterthought by IH and CCC. The engine on the 82 series tractors is tilted up at the front slightly, and the input shaft on the thrower isn't tilted accordingly. This has caused the QA36A on my 782 to eat belts. I've yet to have one last more than half an hour. I will not be using it this year unless I can modify it slightly so that the belt will line up and stop wearing funny. Or maybe something's worn on mine that's exacerbating this alignment issue.
I would stay away from the Haban H42 and H48...they're huge and heavy, and the parts for them are NLA. The engine in your 580 isn't strong enough to run a 48" snowthrower.
The 364 is made by Cub Cadet and is sort of rare, it seems. If you can find one, it would probably be a good choice, but the engine in your 580 may struggle to move large (~8"+) snowfalls since the blower is so wide. I can stall the 18 hp Kohler in my 782 with my little QA36A if the snow is heavy enough...
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