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http://www.steelsoldiers.com/auxillary-equipment/11452-average-towbar-length.html
http://www.steelsoldiers.com/deuce/58135-does-anyone-have-tow-bar-dimensions.html
As for the GMC's bumper pin holes, mine measure to 1.036 on my caliper. So they are 1" pins. If that is what you were referring to...