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The bottom line is that the Offy heads are thicker towards the bottom than stock heads - so the studs are too short. Also, when you're looking at studs and lengths, you must know the lengths of the coarse, the fine and the total to determine if what they are selling will work. You can't just go with overall length - as two studs of the same overall length can thread into the block different amounts (due to the length of the coarse thread).