Someone posted a wanted ad for one of these cant remember who so have a look at this on ebay
http://cgi.ebay.co.uk/BERRISFORD-QUICK-STEERING-RACK-AUTOGRASS-RALLY-GO-KART_W0QQitemZ110174379882QQihZ001QQcategoryZ100921QQssPageNameZWDVWQQrdZ1QQcm dZViewItem
hope the link works first time iv'e tried to post one. Boddingtons does that to me hic

Yep link works

What is important is that the ball joints fit your wishbone set up i.e. no bump steer and the correct ratio of turns.