I used Energy Suspension (#4-7124) ones from USA. Like any Polybush they're not bonded so alignment isn't an issue.

I had no problem dropping the arm/knuckle, but knowing the problem of Focus siezing bolts, they'd all come out and been greased when I first got any Focus.

And yes,that bush does regularly get pulled up on MOT. Ford, like other bushes at the rear, didn't initially supply it separately.....had to change their minds.

Martin