I wish i could, i literally took a lifter and my snap ring pliers to the hardware store and tried them till the fit tight. I have it written down in my project log, I'll try and find it when i get home. I had seen a cam company selling them for Mopar lifters in a set of 16, I think it was Crower, i didn't want to for them to get here, so i just went and found some, so i could push on with assembling the engine.