98 Subaru Impreza L
6-1/2 is right size. The depth or the size of the magnet can make a difference. Hindering the window from going up and down. You may need a lesser quality speaker with smaller magnet
Go to Crutchfield for information. They have a guide that will help you select speakers. You could also remove a speaker and use it as a guide and then you would have no doubt as to what fits.
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