DON'T get the Mach 460 setup. It will be MUCH better if you go aftermarket.
To go to a MACH setup, you need the front amp, both rear amps, rear sub box, all 8 speakers, wiring, tweeter pods. Maybe also the CD player and head. The problem is that the 5x7's are 6 ohm speakers. They are also just woofers (no mid or high freq.) powered from the rear amps. Finding 6 ohm replacements is nearly impossible. You could try Ford, but I'm sure that you could probably buy a whole new system for what they want for them (no idea really). If you get them from ebay, chances are that the speakers are old/abused/blown anyway. You can't just put replacement 5x7's in their place. Almost all car speakers are 4 ohm. The lower the ohm rating, the more power the speaker will draw from the amp. You could overpower the mach amps with 4 ohm replacements. They also will only get low freqencies due to the mach system setup. The tweeters handle all the mids and highs. All 4 tweeters are powered from the front amp. The front amp divides up the freq. and sends the low freq. only to the rear amps (for the front and rear 5x7s).
So, overall, your best choice is a totally new aftermarket system. The mach setup is not very adaptable. In good condition, and all as one, it isn't bad. But you can do much better with modest aftermarket parts.
Rick
