273 rocker arm adjustment

I've not seen aftermarket shafts that have 2 holes at each rocker. Are the ones with 2 holes original 273 Mopar shafts? I know the shafts that Comp Cams, Harland Sharp, and Proform supply with their adjustable rockers do not have 2 holes at each rocker. And if you check the shafts made by Melling and Sealed Power they only have one hole at each rocker as well.