Soliloquy 6.3 spikes


I am searching for spikes for my newly acquired 6.3's, 5-year Anniversary Edition.  Does anybody have a lead on where I might find some?
I read a discussion on this site from 3 years ago where member "upsideofdown76" mentioned that he had all of the parts associated with the Soliloquy lineup.  Are you out there upsideofdown76?
Any information about where I might be able to find these spikes would be appreciated.
Thanks,
Kevin
128x128Ag insider logo xs@2xkevinagurney
The later Solilquy speaker cabinets were made in China are you sure it's not a metric thread  M8 by 1.25?

Best of luck 

Peter 
5/16x24 was the only bolt that fit from the hardware store from several that I tried.  The only sizes I can find aftermarket are 1/4x20, or 5/16x18. I was just hoping to find the originals before jerry rigging something.