I am curious as to what year of alero's you might have. I have a 2003. The rear speakers fit into a plastic retainer that snaps into the frame. The size of the hole is nearly as big as the speaker itself. Are some 6x9's too large for this, or are there different baffles?
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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