Simon
I have a new set of GTD racing uprights that are available. They come with one peice spindles for knock ons fitted on a bigger bearing to prevent knock back on the brakes. They were made to take standard ball joints and steering joint. I bought them years ago to replace my Gardner Douglas uprights at some point in time but when I came to actiually do it two months back, when I went to fit them, with all my other mods I had done, I was way off a standard GTD setup with wheel spacings and brakes and arms that they did not fit. Hence being sold on. If of interest please let me know.