On my 582 with the CH20 Kohler Command transplant with it's original 6" PTO and the 582's 44C deck with the stock 4.5" drive pulley, I used IH- 135462-C1 or 754-3006 or 954-3006 which is 5/8" x 93" long. It works fine.
The original PTO to deck belt belt for both 1862 and 582 with the OE 4.5" PTO with either the 50C OR 44C deck is 954-3003A, which is 5/8" x 89.5" long.
Be aware that you will be overdriving the deck, which Cub Cadet never advocated due to safety regulations. I find that the 44C cuts very well overdriven, but it may shorten the deck bearings life.
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582, 682, 782, 782D, 1282, 1050, 1210 x 2, 1711, and 1811
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