Like I said before Arc Audio is good to go. What kind of components are you using? Are you just going to power them off the head unit? I would set yourself up with at minimum a four channel amp to run the fronts and the lids. You want room to expand. At that point you might as well just change out the front speakers, because, to be honest, at highway speed‘s with exhaust etc. you’re mostly hearing the fronts. Make sure they use quick disconnects on the lid harnesses so you can take the bags off! Not sure what amp you’re using, but you might need line levelers. Bike Tronics makes easy connect harnesses specifically for HD. You also will probably need to take your bike to HD to have them turn on the rear speakers. Check out the HD forums and streetglide.com. There are tons of threads that I found useful before installing my audio system myself.