We have an older dual flush that we love. The mechanism on top of the tank had to be replaced. They tracked one down in Italy and said it would be $300. They could se I was hesitant. They went through the numbers and said if the new part didn’t work they would deduct the $300 from a new toilet.
The part arrived. Zahir, nicest plumber in the world came to install it. The toilet should last another 15 years he said.