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You wont see it on their web site you will need to talk to a rep and give them the model number then they can send you a email of the parts break down page with the correct parts number then you can have them ship you the parts that you need.
since the fixture is used is that the only model number on the fixture or is there another one somewhere else? I already had kohler's number. Where else are model numbers located? If it's on the valve then I have no way to look at it unless I tear out rock.
Since you don't have the box it came in nor can you see behind the wall this is the best that you can do .
that has to be the model number, the other shower at my house had a crap in the cpvc in the cold water line, and I looked at the valve and there was no numbers on it except a type p 016 does that mean anything?
That is something that you will need to talk with a Kohler rep with , they are the only people that can resolve this problem for you , they might tell you they cant do anything for you and you will be out of luck but they are the first place to start.