You probably know this but check out this auction link. I do not know the guy, or anything like that(I am up in the soon to be frozen north) but he has what you want
How much you willing to spend. I got two sets that I just put in my car. Not abused either. Running a zapco 360/4 Probllay olny played a few hours. Don't drive my car much. I'd like to get $800 for both. Their the QSD 216 not the cheap QSC.