The rears from what I've seen here on my search says 18" so that's what I put. I also read that to give it a few days to conform to the shape of the windshielf of the X5. There were some that weren't too happy with the Bosch Icons stating that it is missing the middle part of the cleaning when the wipers were on or its missing parts of the windshield.

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'04 BMW X5 3.0i TitanSilber Metallic
'03 Lexus GX470 Black Onyx
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'03 BMW X5 3.0i Black Sapphire SOLD