Outer Limits 4x4 Board

OK,
I've tried the search thingy for a while now and can't find what I'm looking for... so if any of you guys can point me to a link which answer this question.. plz do!!

I have a 1990 4.2 diesel GQ wagon with 4.1's in it and wondering what diff I have in the rear of it?? Is it the H260 or the H233??
And, what models/years did these different diffs come in??(wagon/ute/year made etc??)

Looking for spare parts and and may be able to get my hands on an airlocker cheap & already fitted to a diff centre, just got to work out if it's compatible with my truck or not. In saying that, is the actual ARB air locker itself interchangable between the H260 & H233 diffs??

Cheers

the air lockers are different
the h260 s are in leaf spring utes and some zd30 auto gu and also the 4.8 gu
your wagon will be a h233 you can tell easy the difference the h260 is double the size to look at due to the larger gears
hope this helps