Northstar Horizon boot disks

Hi all -- I've spent the last couple nights searching in vain for the Northstar Horizon boot disks a listmember produced for me a few years back. I *swear* I had them in my hands not a month ago but now they are nowhere to be found. I'm worried they may have fallen into a box that got recycled. I've decided I want to get my Horizon running again now that I have a bit more spare time (my other current project, a '54 Nash Metropolitan, is now off to the body shop for some serious work) but I'm stuck without bootable media or any way to make my own, so I can't do much with it at the moment. Can anyone do me a favor and make me a copy of a couple of Horizon boot disks (CP/M or otherwise) for this machine? I have the MDS-AD3 double-density controller with a Shugart SA400 drive. (As a related aside, is there *anywhere* one can get hard-sectored 5.25" floppies these days?) Thanks as always, Josh