Measure the diameter of the hole at the bottom of the water holding tank. It’s the main difference between older and newer toilets in the US.
Any US toilet repair kit should list what diameter(s) it supports.
Depth of the holding tank will vary as well, but most repair kits account for this. Some kits may require using a hand saw to cut some plastic tubes to fit smaller tanks. Other kits have an extendable or collapsible tube.
They are not all the same.
Measure the diameter of the hole at the bottom of the water holding tank. It’s the main difference between older and newer toilets in the US.
Any US toilet repair kit should list what diameter(s) it supports.
Depth of the holding tank will vary as well, but most repair kits account for this. Some kits may require using a hand saw to cut some plastic tubes to fit smaller tanks. Other kits have an extendable or collapsible tube.
They make universal flappers now that are actually universal.
And most arms are extendable and can have angle adjusted multiple ways, so basically universal.
If you replace anything else, you might as well change all the internals at once with a set
Except even flappers aren’t universal. Some toilets use flapperless flush valves