David, you may have to replace the complete ballcock assembly depending on the problem, the only parts available for the “41” is the complete unit. They used 3 different ballcocks in the 41 series. I have tried to cross refrence the numbers you have posted but I can not come up with anything. The best way to odentify the correct model is to pick the picture on the identification page posted at the bottom of this message and it will take you to the correct parts breakdown. I hope this helps.