MY02-MY06 except the MY06 4.2 SC use one style of diff housing (rear access cover - Banjo style?) and the MY06 SC and all MY07-12 use a different style of diff housing that has a side housing. Hence one locking centre is unlikely to be suitable for the whole L322 range.
The later main casings are identical for open and e-diff centres, with only the side housings different. Furthermore the later e-diff centres are the same ones fitted to D3s, D4s and MY06-13 RRS (as advised by Todd Tredeau, the principal of Differential Parts USA, a LR differential specialist business) and therefore an ARB locker for the D3 rear may fit the later L322 open diff although the ARB D3 centre wont fit a D4 due to a slight difference in main casing to the D3.

