No, but most replacement parts are semi universal parts that can be adjusted to fit the vast majority. However you need to know what toilet you have as each almost universal part doesn't fit something another one will. Odds are you have a common toilet that any universal part fits - but there are toilets that are not compatible ith anything.
before doing anything though should you replace the whole thing is a question worth asking. do you prefer a round or engladed bowl; what about the height; maybe you want one without stains; or a low water use version that works? It wouldn't cost much more to replace the whole thing with one that fits you better.
That is rare but if they really did that the job becomes non trivial. I'd still do it mysely, but I know how to do tile - it isn't hard but this is now a month long project.