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The door speakers in Geo Prizms From 1993-1997 and possibly newer are 4in. and the rear speakers are 6.5in.
The rear speakers are the same size of the front. 6.75" but 6.5" will work also
Rear deck speakers are 6" or 6 1/2" and the door speakers are 4"
6.5 inches
6 ¾". Standard 6½" speakers can be made to fit by drilling the mounting ring, but it would be best if purchasing new speakers, to buy ones that already have an adapter ring included or are already designed to fit 6¾". Also, because the speakers are mounted low in the door, choosing ones with a pivoting tweeter would be wise.
You have to remove the door panel. Then it's pretty much self-explanatory.
30
6.5 in the back
my 1990 has 4" speakers hole in the back but i have 5" speakers in there now.
They are an unusual sizes. 4.5" diameter in the doors and if you have rear speakers, I believe they are either the same, or slightly larger like 5.25". Using spacers to move away from the window track inside the door, I was able to mount 5.5" speakers in my doors by widening the speaker hole in the wood on the back of the door panel. And using spacers along with some 2" flat brackets, I was able to mount 6.25" speakers in the back with good clearance of the moving trunk parts.
from 1989 to 1996 the size is 108
No they will not fit. after 1994 the Geo Metro developed a new more curved body system. You can use a 1989 - 1994 Geo Metro door though.