I usually replace the fill valve and the flush assembly on old toilets. These are all the wear items in a toilet. The porcelin will last forever unless someone cracks it.
I have several rental houses. It easier to start with all new parts than go fix a toilet at some inconvenient time. The flappers do need to be replaced every few yrs, depending on the quality of your water supply.
Most flappers are adjustable and can be configured for most any toilet. If you take yours off first, make a note of how it was placed.
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'Tis better to remain silent and be thought a fool, than open one's mouth and remove all doubt.
Samuel Johnson (1709 - 1784)
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