Size of the freeze plug at back of diesel head?

I have an 851 D that I've discovered a hole in the freeze plug at the back of the head. I can't get my caliper on a lip of the actual head casting and hate to measure the inside of the old plug and then guess at the outside diameter. Does anyone have a diesel head sitting around that they could measure the hole diameter for me? Many thanks.

Too Many Tractors Tom
 

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