I don't know the dimensions of the Kicker 6x9 subwoofers. Here is one option we have in stock: CDT CL-69SubCF
We also have CL-69Sub, which has a carbon reinforced cone instead of carbon fiber, for $149/pr, and HD-690CF, which is a step up from CL-69SubCF, in stock for $199/pr.
Thanks for the links! I'll do a bit of research to compare dimensions. These will be going in the front doors (factory holes) of a Jeep Commander with the Boston Acoustics factory stereo.