Need crankshaft bolt circle dimension

Does anyone have a duramax flywheel, flexplate, crankshaft or complete engine with the transmission off that they could pull a tape measure across the bolt circle?

This may sound rediculous, but it will save me several hundred bucks over buying one just to find it doesn't fit my application.
 
I have a few apart if you want to call the shop. Looking for the crank to flew plate pattern?
 
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