*PLUMBERSSTOCK EXPERT* responded:
Hi, Richard! Thank you for your interest in our Fluidmaster PRO45K Kit. While this flapper kit fits most 2 and 3-bolt toilet tanks on all brands, it is recommended to use the flapper specifically designed for your Toto MS854114SL toilet to ensure smooth operation. Based on this Parts List, the Toto THU331S is the one designed for your toilet. You may also order an exact match of your existing Toto THU175S flapper with us if you're just looking for a replacement. The Toto THU331S and the Toto THU175S flappers are tagged as discontinued on other sites but we still have them. So, if you want to place an order, do it now by clicking on Add to Cart and entering your zip code. If you need further clarifications regarding its availabilty, please feel free to call our Customer Service Department at 435-868-4020 or simply send a message using the Contact Us tab found on the bottom right part of your screen. Happy shopping at PlumbersStock.com!