I'm looking at starting a 1/35 Centurion from the Suez Crisis, ideally a Mark 5 carrying the type B 20 pounder with the fume extractor. I've got my eye on using one of the AFV club kits but their mark 5 doesn't, as far as I know, come with the type B barrel and my searches for an aftermarket one are drawing a blank.
Does anyone know where I can find a metal type B barrel, and whether this would need the single fin or three fin fume extractor given the period I am trying to depict.
Any help is appreciated.