Convertible softtop roof mechanism

Hi, does anyone have a model of a convertible softtop roof mechanism? Just the bars of course.

I'm trying to model one, but it's tough to see the mechanism, because there's always canvas over it, and because the exact dimensions matter so much. I found some video's of an old Mercedes convertible here, which I'm trying to copy. But if there's anyone with another model, that would be great.

Thanks, Daan