'99 Frontier help

[dizzle9]

So this is probably in the wrong place, but for now I need a quick question answered...

My dad just bought a 1999 Frontier and I'm trying to replace the speakers/head unit for him. I changed out the door speakers but I still need some things.

Where can I find JUST the tweeters for the doors?

And where can I find the in-wall subwoofer, or what can I replace it with?

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