Had my rack rebuilt last year but mine was Cortina and not Supra. It was one of the first few 400's built though in 1988 so maybe using up parts! Kylie Clinton in Birmingham are pretty good for a refurb.
I have recently had my 400se rack rebuilt by Kiley Clinton. Rack was a special built by Supra Engineering and used by TVR and Aston. Its aluminium and the bushes have to be loctited in rather than pressed, to avoid damage.