right I've seen all different years and no 2 I've seen have been the same back there. the 91's i believe have a bigger area for the T-Tops and my year has a leather bag (i took it out) that straps down and the folding is just extra space. I have no experience with fiberglass
I replaced block last year tryin to keep it stock. ...i should of gone bigger though it only runs high 14's