Hello, Colin. I know 18/80 MG parts are rare but the K3 radiator shell (cut down) was from the same pattern, even the same badge escutcheon.Might be worth asking if anyone has a spare scrap one then you only have to remake the lower section to achieve what you want. I can give you measurements. Cheers, Chris P.S. I am NOT advocating the use of a perfectly good 18/80 radiator shell!!