Lenny, my bad. I thought it was the ELM cable
And yea, once you see a baby, they are just everywhere
The 20" rims was just for jokes. I always think of big american cars with DUBS for that. The Focus I think looks good with 17/18". Anything bigger would compromise ride quality too much for myself.
With regards to the Vibe flatflex audio cable, I think you might not need it. From what I recall, there is speaker cable wire, flat that is included in the Vibe wiring kit. Running it from the front speaker to the rear of the car, as you saw in mine, there was still some wire left over from it. I didn't cut mine off and just secured it under the rear seats. Same for the Right and Left cables running from the front speakers. You might only need a short amount of wire to connect the subwoofer to the amplifier as they would be very close. In my setup, I just used some old speaker wire that I had from the previous install.
The 2nd link that you posted for the wire being sold by the metre is what comes in the kit that you bought.