Picatinny crossbolt clamp

[maxrep99]

Is there anywhere I can get a couple standard picatinny to picatinny cross bolt clamps ? I have a Burris Eliminator 3 mounted onto a Barrett M99 416. I over torqued one bolt, but would like a couple extra also. I am calling Burris, but 3 days on hold... Until they reply, I'd like to get a couple generic clamps. See picture. horizontal length is approx 9/16 " Thanks