The offset pulleys for a 50C deck are normal and are used on the supers as well as the standard GT's. I can't help with the haban question as I have only had the standard subframe and 50" decks.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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