Vortex Sound Research

I've got a few modules (the FX Aid and a Clouds Clone) that have a very small footprint, but as a trade-off a lot of the knobs feel way too close together to be playable. I'd much prefer to swap them out for smaller "attenuator" style knobs, but I'm not sure how to figure out how big the ones I currently have are, or what sizes will be compatible with the pots where the big knobs currently sit... anyone have any insights on this?