You need a QD LT-101 because you can't put a 30mm or 34mm on a cobra. You can also use the other mount. Just put the riser and you got one of the greatest scopes (Vudu).
If people already know about this it's fine, i'm just trying to help out. 😀
Source: https://www.reddit.com/r/EscapefromTarkov/comments/f4bk7k/how_to_put_a_tac30vudu_on_an_sks/