Thanks for the suggestion on dealers! Looks like I might give Dixie a shot...
Thankfully, it's just the 15mm exterior that's stripped. I can't get the plug out, and my lack of space and leverage caused me to round the corners of the bolt a bit. I gave up in hope that there's enough left for someone with the right tools to remove it with ease.
Thanks again!
Steve M.
2000 SVT black and tan 7200 miles