Whirlpool ADG7952

I have a contract with a timeshare in my area they called to day with ADG7952 dishwasher the door wouldnt shut, it was caused by the top basket i got that sorted, but the maintence guy had a go 1st and removed the door and broke a part which he has since lost there is a hole in the top left hand corner on the door where i assume the adjuter for water hardness sits the part that holds this in place is the part he broke but i cannot find the part listed anywhere, any help would be most welcome JJ