Looking for the right size lug screws for Pearl Export

Gitman

Junior Member
Hey, does anyone know the sizes of these screws? I'm trying to mount an internal drum trigger with an L bracket and the lug screw isn't long enough. I think it's a 5 gauge, but how do I determine the thread size? 40 or 44? And I can't get the exact length because of the washer. I think it's around 10mm. Thanks!
 
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