we actually got ours made from a metal fabricator. We just gave exact dimensions needed and picked up the next day. Cost us £15.00 each, they are great!
LOL - I was thinking of asking the very same question!! My mare runs her teeth along hers and it has turned very, very sharp - it could really slice something
I am not sure how easy the existing one will be to get off to replace it with a new one - anyone done this?
Our ancient stables have falling-to-bits doors, and one of them has a strip of that metal shelving upright (with the slots you hook the supports in to) screwed into it across the top, underneath you can see where the wood has been chewed and in fact the metal has lasted much better than the mostly now rotten wood!
FIL is making us a new set of doors