Convertible A pillar
 

I've been thinking about ways to reduce the cowl shake in my convertible. One of the things that came to mind was to inject foam in them. I've seen pictures of convertibles with the trim off on here, but I can't tell if the A pillars are box cross sectioned so they can be filled with foam. I don't really want to take that stuff apart just to find it isn't suitable. Has anyone who has seen a convertible A pillar up close without the trim tell me what it looks like?

Doug