Originally Posted by
onehundred80
I would not use silicone as a sealant, if you ever want the wing of again it might be too tight. Yanking on the wing may break it, the roadster wing is not too strong.
On my coupe I found that the O-ring that fitted in the pocket for it was a good fit on the two studs as well. I think they were 5/16" ID. The studs had a radius on them to fit them as well.
When I finally finish this job I will put in some caulking that has stayed flexible in my toolbox for thirty years so far. I will put it around the outside of the well so that the step on the wing supports crush it. This will fill the gap you see when it is assembled, trimmed flush to the support it will not be seen.
I think this stuff has asbestos in it, but it looks like dark grey plasticine. I purchased it in the seventies and it is still pliable. It's probably not allowed to be made these days.
That stuff is called "Duct Seal" and should be available at a HVAC Supply Store.