cark 91 hands free upgrading help please

[Guest supra tub]

Hi all, I have the popular cark91 car kit installed, I am looking to get a 2nd phone to work with this kit as my current phone will not. am i right in understanding that if i purchase the CA-55 converter cable, I will be able to add any of the pop port cradles to it?

I am looking at either the Nokia - 9300,9500,6230i or 6680, all of which have a pop port cradle available, will all the functions work ok, is there anything else i need to think about, I also have an external aerial which currently connects the the cark91 cradle, will this aerial be useable on the new cradles?

thanks in advance for you help.