I dropped one and it had a chunck taken out of it on the bottom.thanks for the infoAs long as they are the same physical size it should not matter. The most important thing, across all the lifters, is that the flat surface that contacts the cam lobe must be flat and in good shape. If there is noticeable wear on the lifter face, it should not be used as it will wear into the cam lobe over time. Lifter faces can be reground or get another set new. Any reason you are not using the other set of a different brand?