Originally Posted by Miata 5.0

I have owned many convertibles over the years. I am stumped by my xfire thought. First of all, why is the front bow of the convertible top 8" thick? Second questoin is, what are the two rectagular plates in the front bow? They king of are where you might expect to find sun visors or something. I searched but couldn't find anyting. Any elp is appreciated as always.
Matt.