if you search worldwide, under rock shox paris, there are two for sure. One NOS(in CA) and one in Italy-used but a long 230 steerer tube. The NOS one is a shorter steerer.
As for the length, it depends on the head tube. I have a 180 head tube on one bike and can run the 230. They also did a 260mm threaded steerer and a 265 threadless alloy steerer tube. The threaded, it was available in a steel and ti steerer. They look identical on certain ones. A bright ti looking color. You actually have to have someone check with a magnet to make sure its ti or not. I bought one recently that the guy said it was ti and it was steel. The last one I just bought he said its ti. not sure yet as I just bought it and it hasn't arrived. The other is a threadless alloy.
Usually a headset is 35 to 40mm total stack. A King is 33 to 38mm. So depending on your head tube length, a 230mm steerer should work.