I should have one on a local 2000 model pretty soon.
Ian,
As long as the fan doesnt stick out much further than than that sensor, it wont be an issue. I had the bumper mounted to a 2000, and everything looked fine. I just cant remember offhand if it had that fan or not. I'm pretty sure it did though.
(I borrowed this pic from someone's www site. Hope you dont mind.)
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Jim Shrake www.ShrockWorks.com Armor! - Bumpers, Sliders, Skids