The RK 428SO drive chain is very good, Pliskin. Any of the brand name, O-ring drive chains will work well on your Zong. In the United States, the KMC 428UO chain is the least expensive, followed by the EK 428SROZ. However, prices are probably different in Australia.
I found the KMC 428UO drive chain on eBay from a vendor who will ship internationally; here's the link.
http://www.ebay.com/itm/428-X-132-Li...#ht_1481wt_905
Spud
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."

Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894