I don't think the 5.8mm version is offered for export. The type-97 with NATO standard 5.56mm and compatibility with standard NATO magazines is for export, but considering Norinco is under US sanctions, you won't find it here. You might find one in Canada, but I bet it'll be quite expensive.
Those configurations depicted in that web page are really just add-ons to the rifle. There are four real "configurations", if I recall, they are:
standard rifle
short barrel carbine
long barrel marksman
squad machine gun
The amount of commonality between the rifle and the squad machine gun is not that high, which is surprising. It's more than just a barrel difference. I actually haven't seen any mention of the carbine in service. I think anyone who needs a carbine (i.e. support troops like logisitics, arty, navy sailors, airforce garrisons) either still have their Type 81s or will get Type-56C carbines, or will just get the standard rifles (which has been shown to be issued to some arty troops).
That webpage just shows various optics. The big one is starlight night vision I guess. One pic is with rifle grenade, and the last one is an underbarrel grenade launcher.
Oh, there's a new underbarrel launcher recently revealed (don't know about status, I assume it was just developed and at most going through trials), the main points about it is that it fires a grenade similar to the Russian 40mm one while being lighter. And it has some kind of recoil reduction system. Muzzle loaded. Again you'll have to see the original source, another magazine article.
I'm really surprised they didn't do anything about the awkward location of the safety with the newer version.