I would go with the comp pro mags. I tried to fit the Harland Sharps on my motor a few years ago, but they would not clear my 1.54" springs (not even close). My old style comp pro mags clear fine...but they are the old ones that are not bushed, so they can't take much more than my current 460# spring pressure without galling the shaft. With the new comp pro mags they fixed this issue by bushing them.