Mobe said "Order the rear fender trim for a softail deluxe, (about $40), go down to O'Reillys or Autozone and get some double sided trim tape, take some dykes, (no not that kind), (the kind that you snip wires with), snip off the mounting studs on the trim, test fit, apply the double sided trim tape, (made easier if you peel off the backing so it can flex), trim the tape with a single edge razor blade carefully, clean the rear fender, spray a soap and water mix on the clean rear fender, slide on, enjoy."
I tried to find the part number on the HD site, but it is not listed. Since it comes stock on the Deluxe and it is not an extra add on part, you may have to talk to your parts person at the HD shop. Sure does look good though, doesn't it?