I need major help!

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Hello I need some help. I have a hustler raptor with a 23 hp Briggs and Stratton professional. Had some issues and am now replacing the entire engine. The model number for the engine is 44u777-0008-g1. The code is 190221yg. I am trying to find the shaft size so I can order the correct engine but with no luck. I’m finding the part number for the crankshaft 597789. Can anyone help me out as to finding the shaft size please?
 

ILENGINE

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Shaft size is 1-1/8 diameter by 4.29 length recommended replacement engine is the 44S977-0033-G1
 
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