phil the steering joint being perished is will cause the road cambers to make to fight to keep the car in a straight line,,,, my cossie had all the bushes done ect but i had issues with the car wandering all over the A127 above 120ish
anyway the bad news is there ni longer available and theres no where thats got em as i wanted a new coupling
you best bet is getting dannyb to fabricate a 4wd coupling to fit the 2wd car, that wil help alot more than you think mate