Sorry to revive an old thread, but I need the exact same thing as OP... one single drive side spoke for my 05 EC300 with stock black hub and DID Dirt Star rim. I sent Sierra Gasser a PM, and will try Hall's Cycles, too, unless anyone has a better idea to get a single GG spoke...
Questions:
1) There is nothing left of the missing spoke, just the nipple left in the rim. I see no evidence of a hit from a rock or stick to the hub or rim. I would think that at least one half of the spoke would be sticking out of the hub or screwed into the nipple. Is this common? Or are these spokes known for unscrewing themselves and it just so happened to drop perfectly out of the hub and is laying in the woods somewhere perfectly intact?
2) Can I ride the bike with a missing drive side spoke?
3) Should I (blue) Loctite the new spoke?
4) Quick tutorial to verify that other spokes are properly tightened?
Many thanks