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
kevinagurney
If you still want spikes for your Soliloquys, try this DIY trick.  Go to your favorite hardware store and buy Grade 8 bolts of the same thread.  Have a friend who has a grinding wheel cut off bolt head and sharpen to a point.  To harden tip, heat red hot and then cool immediately in water.  PS, always practice safety and wear gloves and eyewear.  You can do this with all-thread stock also.
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.