How to find out which vassals have council rights guaranteed in their contracts?

[Genghis San]

I have a number of vassals having guaranteed council rights in their contract. How do I find out who has such a contract, other than waiting for them to force themselves on my council? I have 92 vassals so it's a bit hard to keep track.

I try to change contract (for less taxes they are often willing to remove the council rights), but even when I do I still cannot fire them for 25 years. So I'd like to know in advance.
Also, murdering them would only be a short term solution as their heir inherits the same contract, I think.

[ShepherdOfCats]

If you have some pesky count who has forced themselves onto the council you can transfer their vassalage to a duke to get them off as an alternative to murder or imprisonment.

[Genghis San]

That's a nice tip Shepherd although it's mostly dukes who do this it seems.
Actually I just found a mod called "alert when your vassals possess council rights" which claims to do exactly what it is named. And it does! So, problem solved! (although it does not seem to work for my existing save game unfortunately).