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I poked around on the Harley forums and found that a 205/50R17 car tire should fit your soft tail.
One of the key issues in running a tire this wide is that it comes so close to the swing arm is sidewall flex. The way to eliminate this is by using a tire that has a Z or a Y rating. These high speed tires have an extra layer of belt in the sidewall which virtually eliminates flex.
Maybe you could find a used tire at your local pick & pull and try it first to see if it will clear properly, then order a new one.
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