Thanks for the reply.
I'm in absolutely no rush for them, in fact the original one is near perfect, but I can tell it is fragile, so I know that one day I will need one. Your suggestion of the container is an option, although one of the Members on this site helped me out a couple of months ago with 2 x Cake Tin air cleaners for slant six, from Florida, by air mail and I thought the cost was quite reasonable.
I suppose if/when you reach that stage we could re-think the freight and see what the costs are?