OK every shop I've spoken too about getting suspension gear has been able to quote me prices and availability for all 4 struts. Maybe you need to go to a better shop prefferably a suspension specialist.
the problem he has is that a '85-86 aw11 shock inserts are smaller (diameter) than a '87+ aw11 rear shock inserts...
the rear strut suspension set-up is a different size...
i am still fiding out what is involved in swapping a '87+ rear susp set-up into a '85..