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Easy answer for you. I have personally changed out the speakers in two of my X3's and helped dozens of others. The model that fit perfectly and has a good overall sound with the stock system and upgraded systems was the Alpine SPS-400. They have since changed the speaker to the SPS-410. I cannot vouch for the SPS-410 since any small change can hamper the installation. If you can find a set on e bay or electronics place for under $60 US then buy them. Make sure to replace both front and back doors as unmatched speakers are like unmatched tires. It just really doesn't work. Installation is a breeze if you are somewhat handy and I can walk you through it with pictures if you like. Post or send me a PM I'll keep an eye out for it.
Cheers,
EE
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