If using FLH 1960-84 trees, the FLH axle will work along with the fender in your picture. My father used a 2005 FXD for his clone. He also used the 1960-84 trees, I believe he used modern fork tubes (from BKRider) for a FLSTC because they were a little longer.
Here is a picture during the build.
Notice the use of Fat Bob shocks, perhaps one of the best choices made. A good height for the bike and a superior ride. I have them on mine also.