This looks like unobtainium in the US. If we were in the UK they are about $130.
Looking at the photo Danny provided; I don't think I like the connection to the tie rod ends. Looks flimsy. Your life is at steak here. A photo doesn't tell the whole story. This would be a pretty easy fab up. There must be some other rack that would work. It's short, maybe about 12" of barrel length.
I'll look on.