Yes the Mega 801 Fusions are the same diameter as the regular 510 stuff we're used to (
smok DC or Boge). I have a std resistance in a regular DCT
tank and it's an awesome setup!
Also, from what I've been told, the 510 diamond cartos from them are the exact same thing, just with a 510 connection. I bought 10 mega fusions and 10 diamonds, but haven't tried out anything but the fusion SR.