I didn't quite follow their instructions but it seemed like there was already a ledge on that fairing for a vent. I have not noticed any "shelf" on them before. I would prefer one already in place I think. Price wise there doesn't seem to be a big difference.
Top one is a HD QR windshield mount, middle is the SS fabricated mount, and the bottom one is the mounts that came with the fairing. Had to modify the bracket to accept the HD QR windshield clamps while retaining the mounting position of the fairing.
Damn H, that looks really good. Is that a Harley Batwing fairing?
On a good note, I lowered my windshield about 2" and it made a good bit of difference to the amount of head buffeting I was experiencing. This will serve the interim until I decide which fairing to buy.
I've got a Memphis Shades and it takes the exact same brackets that were on my regular detachable windshield. It takes about 30 seconds to remove if I feel like riding without one.