Thanks for the link Pete, unfortunately I'm in the UK and they won't ship here.
I'm not sure when any parts changed shape but the one I have here has fine diagonal or diamond shape checkering, it looks to be shaped like an upside down spoon (for want of a better description smile ) the owner would like to keep it as original as possible so was hoping to Tig a piece on, then shape and cut the checker before blacking.
Thanks again for your suggestion though.

Rust never sleeps !