Carburettor /pull start (Hanworth RG12)

I need a carburettor and a pull start for a small (5hp?) petrol engine refurb project. Ideally one from a generator or mower or similar 3.5 - 5 h.p. engine: Tecumseh, Honda, Briggs & Stratton, Chinese. etc. My existing carb has corroded beyond repair.