I am sure there is for the Kohler engine, that one would be pretty easy to find.
The hydro filter is a different story, that is a huge filter.
Which one do you need ?
026633 is the Hustler part # for the hydro filter and it has a retail of $ 22.00
The Kohler part # is 12 050 01-S, and is available at any Kohler dealer or for the most part any small engine repair facility.
You will also find this # to cross reference with any brand of aftermarket filter.
Do a search here on the net, you will find it pretty easy.