How to fit a Cabrio Wind deflector??

Hi,

just bought a wind deflector for the Cabrio ( UK 1985 )
( the sort that has a bended metal 'leg' that must rest on top of the rear seats )

But in my 911 there are no mounting holes for the deflector - are there supposed top be some? e.g. in the rear cards?

Anyone with a Cabrio wind deflector able to take some pictures of how theirs fits?

THanks