I got a new speaker out of a Chevy Avalanche today for the Gran Sport. I thought I would have to buy a repro and just haven't broke down and bought one because I am so cheap. So this Avalanche comes in with a broken bracket for the speaker (along with about $5000 in other damage) and to get the bracket you need to buy the speaker with it. I brought home the old speaking thinking I may be able to use it though it was too big. Got home and couldn't believe it when I put it on top of the original and it was exactly the same and will bolt right in! WHOOO HOOOO So i soldered the wires from the old speaker to the "new" one.
I also got a running board from a truck at work (damaged) and cut it up to make the piece that goes under the to frame to mount the seat for my friend. It's going to work like a charm.