Shock Springs for 1030

[kanikune]

Hello,
I am getting ready to maintenance my Rolex in the future. I already know, that my caliber has KIF flector 2-3/73 shock springs in the balance assembly, but I've seen pictures, where escape wheel has KIF duofix (?) shock spring. How to know, which to to choose? Is measuring the only way?
Should be one of these: KIF 10-2, 10-3 or 10-6 (?)

I just recently noticed, that this KIF 2-3/73 is obsolite in my favorite european supplier, Cousins-uk.
There's only 3 types of duofix in my understanding and I want to get spares before they get obsolite too.

Anyone happen to have facts for this?
Also, if someone happen to have huge amounts of 2-3/73 laying around, I'm interested of few :)
Thank you.