Part number question for Disco 2 td5

Hi guys,
I can't seem to find a diagram showing the O ring/seal/washer that goes in-between the low pressure supply adaptor pipe and the bottom of the power steering pump.
It's a small, slightly bent pipe with a diamond shaped plate with two bolt holes and the 'O' ring goes over the short, upper part of the pipe and sits against the back of the plate.
Two requests:
Can anyone tell me the part number of the O ring/seal so I can order one?
Secondly, can anyone recommend a free download of a D2 manual that lists part numbers with 'exploded diagrams' ?
Thanks
Rob

Allbrit.de - Ersatzteile für LAND ROVER & MG ROVER

Try this

and this

for the whole catalogue, might be some subtle differences but usually a good guide

Allbrit MG ROVER & Mini Classic Teilekataloge

its part of the pump assembly so i doubt its sold separately,though you could just buy a replacement o ring its not specialised

Thanks biggeee, I've trawled through those two sites and they don't seem to list the seal. Or if they do, I've not found it.
I've spent a few days (it's pished down here non bl***y stop for a bit) looking on line for parts manuals/numbers and no luck as yet.
That's what I've been after James. I found a diagram showing the pump 'exploded' and it showed the seal but that was weeks ago and as is the way of things, I didn't save the page and now can't find it anywhere and naturally, didn't make a note of the part number of the O ring seal !!! Managed to get the O ring numbers from the top of the steering box but not for the low pressure inlet pipe adaptor on the pump.
I'll keep looking though, no choice, need my car back !! And if it's not raining, i'll be out there fixing the deer impact damage.
Thanks guys
Rob

Can you use a aftermarket o ring?

as long as its the right size any std o ring would do