Hi from New Zealand. Good to hear you've got your parts.
For ref, we have a lot of Blazers here - all used imports from Japan.
Main parts problems we experience most is front suspension incl. the steering box & pump. Also, some dash components i.e. heater radiator & controls, vents & some switches. The Jap ones came with pwr fold side mirrors & fender flares not available on US models. They also have the handbrake & gear shifter in the centre console. US on steering column.
Holden are here so no Chevy dealerships. As a result we are reliant on some Chevy specialist shops for parts. We have one in Auckland who buy used and/or wrecked trucks to strip for used parts.
Google Bunce Motors in Auckland. If theyre not able to help, send me a PM & I'll see if I can help.
We also help out the Aussies on occasion as they have the same issue as you - not many Blazers there.
P.S. I grew up in S.A. Moved to London, UK in early '90's & then NZ in '01.