I have one in a competition .40/10mm single stack. It should drop right in. Note, my pistol does not have a firing pin safety. I have no idea if it will clear the Kimber SII plunger. I have no idea what they look like because I do not own one. If going into a pre II, no problem.
A Series 2 extractor is no different than a Series 70. There is no cutout for the plunger like a Colt Series 80 extractor so the AFTEC won't interfere with the safety. I have known two people who had to "reduce the diameter" a bit on AFTECS to make it fit in the all the way in the channel.
Mark, I was having some extraction probloems on my new Custom Target - in 45. Killed a match for me - The Aftec is just a more reliable extractor since it doesn't count on the correct bend of the steel, the springs take over for that -
If you have a well tuned extractor and a spare, you're probably fine, but a 'normal' extractor wil probably break before an Aftec - one less thing to worry about for me in USPSA matches