Most of the CSL's I see have the rubber lipped spoiler mounted with adhesive or some other method with no visual anchors.
My CSL's spoiler is mounted from the top (and has been since I first acquired it in the 80's) using screws with the finishing washer in the exact location as this diagram from a spare parts booklet someone on the forum posted a few months ago.
It's not as nice looking but is this the original method to anchor? See parts 14 and 15 and the associated placement of anchor holes.
My CSL's spoiler is mounted from the top (and has been since I first acquired it in the 80's) using screws with the finishing washer in the exact location as this diagram from a spare parts booklet someone on the forum posted a few months ago.
It's not as nice looking but is this the original method to anchor? See parts 14 and 15 and the associated placement of anchor holes.