Don't make it a tractor!

You could always fit the rack limiter kit to the ka which will stop it rubbing on lock, it's £60 from ford.

you'll need anything from et35 to et20 depending on the wheel width, with et25 and a 7.5J wheel you won't get scrubbing as standard, assuming it's 16" or less. if you spent some time playing you could probably get 8j on the front 8.5 on the rear, think a guy in germany did it. again size is the killer ;/