Just seen this, and it will come up again as we try and keep these 262's going. Tanks are nla for a while and would probably be $200 if they still made them.
Discovered an interesting solution to this couple years ago. You can use a 51/55 tank on that chassis which are plentiful everywhere. Just need to use the threaded mounts from the 254/257. Obviously the 254 and 257 tanks can be used as they are pretty much the same thing. Yeah, it's gonna vibrate more than it used to.