Re: Speed knobs for one meg pots....
If they are split shaft pots with splines ... The Dimarzios are made by CTS, I think, so they are probably fine spline (24 splines). The ones you removed are probably coarse splined (16 spline I think). They have two types of knobs to accommodate the different spline count. One or the other will fit. Compare the splines on the new pots with the ones you removed to see for sure if you need fine or coarse spline knobs. It should be easy enough to see the difference.