M'kay. Did some digging in various places and it seems that at least some minor mod is necessary even to replace the stock dash speakers with 6x9s. Is this right? Why can't I just pop the covers off, unplug the blown speaker and install a new cheapo 6x9? Different size flange or something? I have no desire to upgrade anything, so I'd like to spend as little time and dough on this as possible.