The Kappa are 16cm
http://www.nengun.com/unknown/infini...pa-60cs-153157
The Pioneers I have are 17cm, thats the problem.
I am in no rush (I have had the car 13 years !) and the standard ones are not damaged at all, so I might watch out for some 16cm units on ebay.
The pair I have are from a set of four (two 2 way and two 3 way) that I took out of one of my cars a few years ago. I can sell them as a full set. I picked up the 9 by 5's on ebay that I fitted on the rear shelf. I also have a 12" Sub in the boot.