
heres the problem:
transits have been on the go for years in various guises...
and i would imagine that several designs of ball joints have been used over the years....
so what years of manufacture / models are the ones big ron is on about???
the book appears a little vague on this
can't remember number, its in book, i had no problem getting 2 from local factors by giving them the number in the book.
Its a transit track rod end your looking for.
mk2 and early mk 3 had steering box not rack,the drag link has ball joints you need(there are 2 different thread sizes)you need 2 right hand thread
joints,hope this narrows it down a bit for ya 
Just ask for a drag link end. Needs an M18 fine thread on it, both right hand! Also get a lock nut if you can.
Chris
Transit '65-'84 Drag Link End Right Hand Thread
Ford part no 17996516
From a printout of somthing I think is on the yahoo-list.
thanks guys,
once again....
ask and ye shall recieve