I don't know about the dimensions of the Kicker speaker, but if you are just worried about the wiring connection, there are adapters available at Crutchfield...or you can cut the wires and put on your own connectors. Just make sure you match the polarity. I'd recommend the plug and play adapters from Crutchfield though.
The part number for the speaker wiring harness adapter is 120 71-050. I assume it is the same for the Kickers if they have the regular spade-type connectors.
You might also need some type of speaker mounting bracket adapter if the mounting holes in your speaker do not match what is in the jeep. Crutchfield has those too.