This is the correct lever for my American Standard toilet. However, it does not fit in the square hole. It appears that there is a tiny bit too much of the ceramic glaze in one corner of the hole. I have been attempting to “shave” it down using a wood file, being careful not to crack the tank. I have not yet been successful.

The handle base was 1/16 bigger than the original identical american standard tank. Required a 1/2 hr of dremel tool grinding to enlarge the square opening of the tank.

The new Lever with the metal part was 100% better than the original with the plastic part.