I looked for and found single Ribes, but they cost more than that set, £40 and up, each! The Laser ribes, same as the ones in the set, are available individually and are much cheaper Ribe Profile | Specialist Bit Sets products from Laser Tools
but I didn't find any being sold anywhere I could buy them easily and not have mail delays.
I'm not 100% sure about it being M14 heads despite having spent an inordinate amount of time looking for answers on the web. About 95% sure but some Alfas (TS) have M13 apparently. That was another reason for hedging my bets by buying the set. If you can wait until tomorrow I'll be able to tell you for sure after I collect from Halfords as I've decided getting the head off is more important than food etc.
I've not begun to look for gaskets and stuff yet. There will be quite a pile: head gasket, cam box, inlet and exhaust gasket, valve seals. Usually it's much cheaper to buy a cylinder head overhaul kit than individual bits.
I also don't know if the 10 head bolts are re-usable, or single-use stretch type. Stretch ones usually have a pronounced concave waist to the shaft, rather than straight. The only pic I found was ambiguous. But I expect they are stretch.
I'm sure it'll work out eye-watering anyhow.
Pink antifreeze = probably Paraflu, Alfa's brand of choice.