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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.

Kohler dealer site shows the crankshaft in the xt675-3105 is a 3/8 x 24 bolt

Thank you! I still wonder if the other two would work with the 7/16x20 bolt. Both are about 100-150$ cheaper in price.