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If you are working with a stock factory frame and front forks you should have no problem with fitting the new rims/hub package using the original spacers and axles...However, you need to find out if what you are replacing is stock!!!!
Big time congrats on the Fat Boy. It's one of my top 3 favorite bikes that HD ever produced. Outstanding machine!
If I had a Bad Boy, the Black King Spokes are the only wheels that would be in my consideration. IMO, nothing would look better. King Spokes are fairly new to the market and I've only put about 1800 miles on mine so far. But at this point I'm very impressed with them. Fitment for me was a breeze. It don't matter whether you go with an 18" or 16" on the rear, your stock axle works on either being that they have the same hub. Because of the different outer diameter of a 16" vs. 18", it may throw your speedo off a few MPH, big deal. You may want to slightly modify the spacers to center the tire under your rear fender. But I'd first just try the stock spacers to see how it looks. I believe the stock front wheel is a 21", but hopefully somebody can confirm this. They seem to be awesome wheels at a great price. You can read more about my opinion & experience with King Spokes on this thread: https://www.hdforums.com/forum/evo-c...by-ultima.html
Best of all, rather than dropping $800 plus on eBay, you can get them for under $500 shipped if you buy them from Jireh: http://www.jirehcycles.com/
I'll be looking forward to seeing pics of your new ride posted soon
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