I bought some four inch speakers to replace my fronts, but they are too large as the tweeter disallows the grille from fitting on and only one screw hole fits. I believe the speaker size is R100, as in 100mm. I have not been able to find these anywhere, even Crutchfield's overpriced offerings. Has anyone been able to find some upgraded speakers that will fit? I'm not looking for high power handling or anything, just something that will fit reasonably and handle a modest modern radio/CD player.