Saving Old Seagulls

I recently neglected to tighten the bowl on my villiers carb...on an Forty Plus and in the dark and fog it fell off and lost the bowl and the float. New carb for it is rather expensive and this one runs great. First does anyone have these parts for sale? Second does anyone have this whole carb for sale---I'd rather purchase it and match it up. Third, if unavailable what kind of carbs fit on the forty plus (FP 1735 KK4) I have an Amal (not sure of model) of a silver century plus...Any thoughts
Thanks
John