I need some HELP..

I live in Montana and there is not a Land Rover place around here to buy parts.

I have a 2003 Land Rover Discovery se 2 and my High Pressure O Rings are shot. It runs out of fluid within 10 miles and I can see it leaking at the High Pressure side at the steering box.

Problem no one carries the o rings everyone just carries mass quantity of general o rings and they all keep asking for the sizes.

That is where my problem is. Can anyone tell me the sizes for the following?

QED100100
QED100110
QED100120
QED100130

Thanks
William