I found some front speakers at www.crutchfield.com they let you search by model and year. I don't think the fronts are 4*6 I believe they're a bit smaller, definately an odd ball size. All the front speakers I have found so far do require at least some minor modifications, probably not too big of an issue though. On another note though, I do agree that the factory stereo is quite poor but when I first purchased my car I was relatively impressed considering it's an 81 model year. I guess in this age of digital sound it only makes sense to invest in good speakers, especially if your a music lover.