The ZSU-23-4V1 model (selected for the SIM) was exported only into 3 countries. Eastern Germany, Hungary, and Egypt.
Small firing zone...
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home