Gotta go with an HD version over the Memphis brand. The QD attachment is solid and high quality. I've been disappointed with the Memphis brackets as they're aluminum, eventually spot badly, and are nowhere near as solid as the HD.
I have a Harley QD windshield thatI can't use anymore because of the driving lights I mounted. If you're interested in it, PM me. It's in really good shape.
AHHH! I was too late. I just purchased and installed mine last week. You shouldn't have a problem selling such a common accessory like this. Good luck.
That's the National Cycle Streetshield EX p/n N2568 - not a bad windshield. Their QD leaves some hardware behind on the handlebars and forks. For all the more I use a windshield, it's OK.