Cars got to be as it left the factory / standerd running parts for any warranty claim.

Even a simple mod changeing the wheels to bigger ones out it won`t be warranted .

plus you can get a warranty repair at any uk ford dealer don`t have to be the one you bought / got the parts fitted from.

Only way is to re fit back to the standerd bushes and anything else thats not standerd and ford will then replace the part inc labour under warranty.