lol, no they don't have a 4s speaker size, but they should have plenty of 4ssssss, as in the plural.
As for rear speakers...they are there to let the passengers in the back hear the music better. In a true musical environment why would there be speakers behind you? I dislike rear speakers because they mess up my imaging in the front. Try turning the balance all the way forward for a few days. You'll see what I mean. Anyway, if you keep it like that then there's no need to replace the speakers back there.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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