The blue 156 v6 developed a leak in the upper small heater hose and after a lot of enquiry. The replacement part is no longer available and i havent been able to find a local manufacturer to make the formed hose...
Will be attempting to create a replacement over the next 2 weeks. By connecting the dissimilar pipe diameters with a 3 part of assembly of 2 hoses and a small radiused steel pipe custom made by a fitter and turner.
These guys might be able to help, that have the 4cyl version
https://alfa-restoration.co.uk/shop/alfa-147gt-161820-heater-hoses-set-p-3955.html?sort=1a&cPath=59_99
thanks have just emailed them
the hoses look like they are for the 2 litre.