fasttech sells magnets or you could buy the Smoant Battlestar
mod. It is a terrific mod, does 200 watts, temperature control, has tcr settings, and is the only mod that comes with four additional magnets in case you lose some. You could take one of those magnets and see if it fits your
device or just throw yours out and start vapeing the Battlestar with confidence knowing if you lose a magnet you have plenty more.