Need a little help!

Today I checked and made sure all the spark plugs were within torque specs, I am worried about a plug blow out.

Anyway, someone before me on one of the coil packs, rounded off the 7mm brass bolt head slightly, and when i tightened it, i finished the job. The bolt is on their tight however now it is rounded off and has to be loosened with vice grips, I cannot find a replacement part listing anywhere.

Does anyone know where I could get one of these bolts, I have looked everywhere online and cannot find anything.

Thanks
 
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