Mark, don't go to Fords, way too expensive.
What has exactly gone on them.
is it the 3 legged bearing on the end.
these are about £40 each from Woodford.
You could buy used drive shafts with then on, theres a set for sale in the parts section,may be complete.
I have fitted the 4x4 ones in mine,these are slightly longer and supposed to be better for lowered cars.
i have had no probs with mine.
Dave.