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Hi and welcome.
No, you don't have to have the arches. But they look very good with the staggered 20's and would be recommended.
No, there are no issues with rubbing. If you search the site you can find pictures of X5's with 20's with and without arches so you can compare.
Last edited by ncx; 12-14-2007 at 11:07 AM.
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