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Dwellonroof
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Hydraulic Wheel Motor Tapered Shaft Adaptor 1-1/4" to size W Hub White Char Lynn | eBay
Hydraulic Wheel Motor Tapered Shaft Adaptor 1-1/4" to size W Hub. 1-1/4" Tapered hole. Fits Size W weld on sprockets. 1-5/8" Pilot.
www.ebay.com
Or maybe have the old hub drilled and weld something like this in place