John Deere Model 400 convertion to Honda 24 hp engine

[rramrod58]

I have a John Deere model 400 with a kohler K532 20 hp engine the old kohler has a broken rod so I have a Honda GX620 24 hp engine from a trade I made awhile back it looks like it will fit and the small engine warehouse has a motor like it that will fit it comes with a conversion kit but they will not sell the conversion kit by it's self I think that is pretty sorry but that is another matter
does anyone have a line on a conversion kit
or has anyone done this conversion and have some advise
Thanks for the help
rramrod58