My magnets came in from Deal Extreme. I ordered the same one's listed in the original post. They fit in my Nemmy clone from
fasttech with no modification to the switch. So far so good with them installed. The switch is smoother and feels really nice. The magnets are strong enough to set the mod with an rda on it in 18650 configuration on its switch end and not fire. It does sag a little under the weight, but holds up to the weight without firing.
I was a little worried about that slight sag so I put 3 magnets in the switch and tried that. Wow, definitely no sag, but talk about a stiff button push! They fit though and the mod fired. Back to just the 2 magnets.
This is the first magnetic switch I've had, so I'm still getting used to it. Will update this thread if something comes up with this setup.