Choose panels from specific U divisions created by Lunchbox.

I used the component Random Quad Panels from Lunchbox on multiple surfaces with 4 U divisions and about 20 V divisions (I don't think that the V divisions are relevant in that case)

The result is a huge list of about 2000 surfaces. What I want is to isolate the second and third U division on every surface and then randomly choose some panels (with Cull maybe).

Do you have any recommendation how I could do this?

Thank you in advance