Find a Kohler dealer and have them look it up. The dealer I went to and asked about it said there was an entire part # for the kit, but they couldn't seem to locate it. They looked it up in two or three groups, I guess the bracket, the filter assembly and the hose and elbow. They came up with a price under $200. I guess if the Kohler dealer doesn't understand what you are trying to do, tell him to show you a diagram of the 26 FI engine.
Exmark's new web site list part numbers for this conversion for Kohler horizontal engines. They are Kohler # 24 743 22 for the cleaner kit. The elbow kit is Kohler #24 743 20 for the CH18, CH20, CH22 engines; Kohler # 24 743 25 for the CH23 engine; Kohler #24 743 21 for the CH25 engine. <br>