Called Jeep Parramatta. Apparently you can only get this hose with the accumulator and the hose going to the flywheel. The accumulator and the two hoses that connect to it can only be purchased together
Price is $398 Ex which is probably not so bad including the accumulator, but a lot more than I wanted to pay for just the hose
Part number if anyone needs this in future: 55115-909AC
Actually this part number may not be correct. The diagram the guy at Parramatta Jeep was going off (only diagram he has for my vin) showed the US layout, and this part number comes up on US sites when I do a Google. More grrrr.
Edit again: Parramatta definitely has the wrong part. The US accumulator variant has the hoses molded, they're not detachable, which explains why you can only buy the accumulator with both hoses as one unit. On ours the hoses are detachable.
Why do I always seem to find these mistakes!