two choices, I went for Fli 5 with adapters, you'll find the wires for the speakers in the rear light wiring loom, just taped up. Take off the boot sides and the speakers screw in behind the vents. Using the adapter kit, just plug in the adapter and screw in the speakers, job done!
Speakers
Adapters
Or, amp and 6X9s on the shelf.
This amp could be hidden under the passenger seat, and have it powering all four small speakers, or bridge two channels to power the 6X9s and mount it on the parcel shelf along with the speakers to save space.
Amp
Speakers 6X9
These links are for caraudiodirect.co.uk, to get free shipping, quote '7e6e57' as a voucher code. I really do recommend amping the speakers, (I have the same ones), they're good now, but they'll be brilliant after
