Quote:
Originally Posted by MiraclePieCo
Just took my '51 running boards off - they were 1/4-20 carriage bolts, however I have no idea if that's original or not.
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MiraclePieCo, I think my running boards are stock in all ways on my '54 and the nuts on the 1/4 inch bolts are square. Had to make a special socket to get them off. My factory assembly manual shows the nut to be GM part 131395 nut but I don't have a cross reference so not sure what that nut is in real life.