the front mid is largely un-necessary. it adds complication and options, but for a basic build, a 2 way component is good. there are 3 way comp sets that could use the space, but they are much much pricier. things like JL c5 653.
for the rear, pretty much any 3.5 coax will fit. the rear doesn't do much in this car, many people don't even bother with them. I have a set of infinity cfx 3002 in there
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