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Hello, That particular engine I see they no longer make. I am trying to find its replacement. The options i came up with are XT675-3088, XT675-0041 They both have a crank bolt of a 7/16x 20
There was one more option I saw was a XT675-3105? Now what worries me is that I think the factory crank bolt in my XT675-2075 is a 3/8 size?? and If the 7/16 will be able to fit through the blade adapter.

this is uses 3/8-24 crank bolt.
but really any engine that is 25mm x 2.66" Crankshaft, Tapped 3/8"-24 should replace yours... but you can always go to the local Ace hardware, or any hardware store and buy the correct thread type Grade 8 bolt.