M62 Cylinder head install

Good Afternoon All

Just joined the community and am seeking guidance on a particular item regarding the M62 cylinder head
Am ready to re-install but the manual states an O ring is required but am at a loss of locating the item through the spares network
Additionally have been informed there could also be a non return valve required?
Vehicle is a 2004 4.4 V8 Vogue
Appreciate any assistance/information in advance

Many Thanks

Welcome to the forum

This section is for introductions only. Best to post yer technical questions over in the range rover section below in the link.

https://www.landyzone.co.uk/forum/range-rover.10/

Hello and welcome to landyzone

Hmmm, wrong forum but you have manners and I like the name so,

Two people that may be able to help you - ‘saintV8’ or ‘henry_b’. Seek them out in the RR section/searchbar

Welcome also