All you need to do is cut a square of metal or plastic and drill four corner holes for the clips and one center hole for the tweeter. I just traced the stock tweeter mount plate onto a piece of plastic. I used a little piece of clear plastic (plexiglass?) I found in the storm window/door isle at Home Depot. I used a door panel tool I bought at AutoZone to pull the clips. It looks similar to this:
http://www.autotoys.com/x/catalog/DO...UXE_p_683.html