IH 3150 U snowblower for lowboy???

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I have a front mount IH3150 U snowblower. It was on an A model, but is white so looks like it might be for a later model possibly a lowboy? I'm trying to find out what size the PTO drive pulley was. The driven pulley is 6 inch. The blower itself is about 5 ft wide with little wings sticking out each side.
Any info will be appreciated.
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