Robin, they are gas charged. I'm pretty certain that the only potential problem he could encounter is that the mounts/bolt tubes (or whatever they're called) may need to be cut down to fit a 240. So with a little work, I think they'd be fine.
I really wish I could rebuild them myself, but I don't have the slightest clue what might be wrong with these ones. They basically provide very little damping at the moment.