In addition to some of these key blanks being sold in the wrong configurarion, as compared to original, they are also being sold in the wrong type of material (not brass) and the wrong material thickness. This could cause a new key cut to either the number code or to a master key, to not work well in the lock cylinder. Also, a steel key would wear the internal brass cylinder pins a lot quicker. I recently bought some new key blanks from Carpenter that appear to be good copies of the original configuration.