Hello priyanka,
Here is the link for the official website of CSAB.
https://csab.nic.in/cms/Public/Home.aspx
You can go through this link and click on the tentative seat vacancy for CSAB Special counseling 2019 link. Then vacent seats for institute wise will be displayed. Hope it helps you.
Thank you.

Hello Priyanka,

The official link for CSAB is given below -

https://csab.nic.in/cms/Public/Home.aspx

Here is the tentative seat vacancy for CSAB special round -

https://csab.nic.in/CMS/Handler/FileHandler.ashx?i=File&ii=141&iii=Y

Hope this helps.