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1. Fitting the overflow tube (it was too narrow a gauge - so I re-used the one that was fitted to the defunct valve), and 2. finding the rubber washer that goes at the bottom of the valve's water intake and the inside of the toilet tank ( it wasn't red as shown on the box cover - it was black and came in combination with the dome washer - so the dome washer had to be pressed out to leave the round washer).
Plus there is a YouTube video that runs you through the installation.