ERA bricks are easely replaceable. In fact, they MUST be replaced after 10-15 years due to age issues. ERA bricks holders are somewhat harder to replace due to possible interference with optics, APS, etc. So i'm almost sure newly produced T-90 have Relict ERA bricks inside.I had someone tell me that you could not place Relik on the T-90 due to turret design configuration but I do not see what the difference that would make, if they are going to keep them for a couple of decades I would think that they would want to place their best armor package that is designed.