Does it really matter what strings you use?
"I wanna sound like Kurt, I wanna sound like Kurt."
AAAAAAAAARGH!
I suppose you'll only really sound like him if you get the exact same rig, have the same pick ups in your mustang, perspire the same amount so the strings sound the same,( don't want to change em too early do we? might spoil teh kusrdtz!), oh, grow your hair to the same length he had it, depending on which era you wanna replicate and finally, be sure to make a home made Flipper t-shirt. Has to be the same as kurts though otherwise it won't work.