My plans are to put the two same flags as well. The cross may work. Thanks

 

I made mine out of 3/8 s.s. rod, machined a stop on the bottom end,shouldered it to .350, then treaded the very bottom to 1/4-20. Machined a stop for the bottom of the flag, and shrunk it on. Then threaded the top of the staff to 3/8.....then topped it off with a cap nut.

 

I have seen literally hundreds (possibly thousands) of creative ways to mount a flag(s) on bikes. Most of them do incorporate some use of a luggage rack. I noticed that the OP is a member of the Patriot Guard Riders. Go to a few PGR missions, you will see something that will work for you, and get some great ideas for this.

 

I made something similiar.
I'll get pics posted when I get off work.
It's worked pretty good all year. I had it on during Sturgis and all the Vet/POW/MIA rides we've done.

 

Pictures...Pictures. When I did the search for flag pole, all the big bikes had lots of information but, the sportster had almost nothing about "diy".