???'s @ Top cap on blazer bedsides

[VA72C10]

I see people with nice top caps on their bedsides when their top is removed. Are these simply pieces you use to cover the bolt holes and weatherstrip when the top is removed? If so, how are you attaching them? Since you have to take the inner panels off to remove a double wall top are you just bolting/unbolting them in the top bolt holes? Thinking of making something like this for my 71 and seeing if it's worth the time/money or not....