http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=240-744&DID=7
if the link fails for some reason, check out partsexpress.com and search for high mass speaker stands. They work very well with my Nautilus 805's and the top plate is nearly as large as you specify.
if the link fails for some reason, check out partsexpress.com and search for high mass speaker stands. They work very well with my Nautilus 805's and the top plate is nearly as large as you specify.