Douglas. I thought that the 'butterfly wings' went inside the groove leaving nothing between the strip and the car body. Now that I have examined them I see that they are slightly wedge shaped and I have slipped them into the strip with the "wings" on the outside to form a barrier between the two metals. Easy. It's on and looks great.
That is a great example why I don't get involved. I just don't see these things.
Thanks a lot. I knew you'd know.
paulr
lovely 1970 280 SL