The one in your link says its a lower line, which would go from the splitter to the caliper. I think both upper and lower would have the same fittings, one end goes into a rigid pipe, the other goes into a female port. So the only difference would be length, seems to me.
I just had both lines made, I brought the originals to a shop(omniquip) and they made replacements. I went with rubber, and kept the original hard lines and the splitter.