Hi-
The main benefit to these, which is complete integration into the bike's CANbus computer for automated operation via stock switchgear, doesn't apply to Harleys. So they can be a bit expensive for "just lights," even though they're fantastic lights.
For Harleys there are plenty of good choices. On a budget up front up I'm partial to Truck-Lite. They're available all over - see
https://www.amazon.com/Truck-lite-Headlight-Drive-Harley-Davidson-Touring/dp/B00Q0TIGSS I met the engineer who created them at a military show. They're actually used on HMMWVs, tanks, and other military vehicles, with an integrated defogger. Turns out Harleys use the same sizes (7" or 5-3/4") so they just eliminated the defogger, modified it to work with 12VDC instead of 24VDC, and there you are. These are every bit as good as the rebranded LED lights Harley sells (which are really just "Speaker" brand, mostly) at a fraction of the cost.
Out back, there are some nice choices too. My two favorite for Harley would be
1) Admore's new Light Bar
http://www.admorelighting.com/light-bars/AdMore-Light-Bar-Premium-Smoked-Lens
I've tested this for BMW but it works on any brand. For $199 you get brakes, turn signals, and complete customization via an on-board USB port you can connect to your laptop to modify all settings. ALSO, you get an integrated accelerometer -meaning the brake lights can be actuated by G-force alone on deceleration. This is a great safety feature because it alerts traffic behind you if you (for example) downshift hard, without you having to actually hit the brakes. (You can turn this on and off and modify the G threshold as desired - but the idea is brakes will light up without you actually hitting the brakes.) No problem on CANbus bikes, either.
2) Skene P3 -
http://www.lights.skenedesign.com/P3_Features.shtml These are a staple in the sport-touring community. They work well, are very small, and don't cost too much. They can be programmed, too. When actuated they are bright as all hell!
Hope this helps.
-MKL