It is recommended to lower the front one inch but not required know couple friends that did not lower front end riding 21" and rides as good as stock set up.
Fender may need to drill back mounting holes to 3/8 tipping the fender up for clearance. Also know of some cases didn't need to drill.
You can put a 3/8 nut on top of the 21" tire if runs through no need to drill the fender.
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2012 Custom TTS tuner, Vance & Hines Power Duals with Hi Output, 57H Cam, J&M Amp and Speakers many others...