If you are going to replace the door speakers, aftermarket speaker brackets that fit are hard to come by. The factory speakers come welded to the mounting bracket. Your best bet is to drill the welds out to fit the new speaker into. You should find that the new speakers will fit perfectly in the factory brackets.
As far as a harness goes, I BELIEVE you can use the ones that fit the Legacy. I seem to remember them being identical.
Good luck!
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Dan Taney
1996 Subaru SVX LSi (Red)
2019 Subaru WRX LTD
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