R/F amp will work, along with the J&M ROKKER/Performance amps of course ,,,,,,
main thing is to have your Harley Infotainment radio flashed as they come stock, ((( 4 or 8 speakers, all amps OFF, and if you will connect more than 2 speakers to the system you might as well engage the Fader Control while you are flashing at the dealer))) ,,,,,,,
as for what are THE BEST speakers to install into your fairing ? ,,,,,,,, you will get enough opinions on that to write a book with ,,,,,,,
I will tell you however that THIS speaker kit from J&M
http://www.jmcorp.com/ProductDetail.asp?ProductID=HCRK-6652TW-RXX was designed for this specific application ,,, and they will handle just about all the clean undistorted power you can throw at them ,,,,,,,,,