To summarize :
1) SAP 518 - Heavy (drop tank size), Doesn't interface with Tarang RWR properly.
https://www.livefistdefence.com/2017/02/how-a-secretive-drdo-lab-is-saving-the-iaf-su-30mki.html
2) ELM 8222 - Light (SRAAM size), Interfaces with Tarang RWR properly, full integration with...