Odd question but I have a 2002 Citroen Dispatch (it's a wheelchair accessible vehicle for my uncle). The windows on the rear seats (behind the driver) have circular holes in about 1" diameter. I understand that a rear window moulding button is supposed to go in there. I have them. But I cannot for the life of me work out how. Can anyone help please? I've tried Googling to no avail. Cheers.