Replacing my engine in my Husqvrana HU675AWD W/Kohler XT675-2075 options

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.