Wish I had an answer for you but you have an aftermarket blower and I don't have access to the info on it. If you are the original owner I suggest that you contact the seller. Just my 2 Cents after looking at how it is designed I would stick at least a grade 5 bolt in it, tighten it up good and hope for the best.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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