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[gaijin71]

if i remember correctly, the front speaker grilles of the '82 corona can be popped off the dash by using a flat tipped screw driver. just do it carefully so that you don't break the plastic grille.

i don't recall the '82 corona being sold with rear speakers here but i'd suspect that a 5.25" speaker would be a good fit in the rear if you don't want to cut/bend the rear deck sheet metal.