Being a former Car Audio Installer, yes the rears are 5x7, 6x8's work better, and give you a little bit bigger speaker. The dash are 3 1/2, and the doors will take 5 1/4 or 6 1/2. Just watch out for mounting depth on the doors. There's a company call Q-Logic, and they make some very nice kick panels for Mustangs, and they will hold up to a 6 1/2 speaker, and have a spot also for a tweeter. I've intalled these in the past, and they look great, and depending on what you use for speakers, sound great. Any other questions, drop me a line. [email protected]:green
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