Toilet outlets do vary, so best to decide which toilet you are going to fit and find out the dimensions. Don't forget to allow for a slight 'fall' and also any flooring which the pan will sit on. You can always fit an offset pan connector.
7½" is an industry standard but a long time ago [pre war] it used to be 9½"
If you find anything other than that its probably cheap Chinese piece of crap
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