GM Killed Hummer...shame..but it will live on for years and years to come... perhaps longer now then if they had not killed it off.
We carried a bunch of service parts for Hummer owners but deffinately do not try to even come close to specialising in them..but help we can when needed ... or people with Hummer type engines in other vehicles. With the slow but steady influx of Hummer Vehicles from the late 80's to the rare but increasingly seen late models H2 & newer H3 models. We'll help where help is needed and have pretty good access to both immediate inventory costing and stock both here from our service stock and more intrigate parts pulled via US GM and other sources.
Other people in Australia we recommend you contact is Eagle Spares in Melbourne (03 8710 3000) - for parts for these also.. including full engines, gearbox's & diffs.
Due to the global sourcing and production differences in these.. if calling and less then 100% sure of actual year and build.. they will request VIN details where required or if you have say a 6.6 lit D in another vehicle..try and find the year of production if needed etc.. it all helps.