*PLUMBERSSTOCK EXPERT* responded:
Good day! We appreciate your interest in our Kohler GP1078441 Flapper Assembly. For us to be able to help you better and give you the correct recommendations, we need to know your tank model. You just need to take the lid off and on the wall of the tank, you should see some numbers or letters. Get us everything you see and we shall check what it brings up to help you get the flapper that you need. If it's more convenient for you, you may also contact our customer support specialists at 435-868-4020 or you may email them at email@example.com. Just have your tank's model number handy when you do. Should you have further questions, please let us know. Thank you for visiting plumbersstock.com – your one-stop online store for all your plumbing needs!