This link will help you
http://kohler.dirxion.com/toiletserviceparts
The flapper is not proprietary to this unit an after market flapper will work as good and in most cases better. The flappers offered but Fluid Master are in my opinion the best out there. Remove the flapper and match it up with one offered but them, install it and you will be good to go.
The problem with getting the stock part is that the toilet your working on was discontinued so time ago and unless you are ready to give up your 3.5 gallon flush toilet keep fixing it as long as you can.
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