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We have since added the dimensions to the "Dimensions" tab on this web page. Please review it for complete dimensional information.
We measured the I.D. of the hole size. It is 0.39". An AN6 would be the closest sized bolt that would fit into this hole size which is .375 in diameter.
The two longer sides are going to be 2-3/4" long and the shorter side is 2-1/2" long.