Good news, i found a guy selling some new NST's he has 4 of them, he listed the like this.
1x 5kV, 30mA
2x 6kV, 30mA
1x 8kV, 30mA
Anyway i asked for photos of each one and found something interesting.
I found on the 5kV NST it said "5000-E-5000" meaning there is 2 windings 5kV each!
Also...