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Hi MrFathead, This is on my things to do list for my XF but haven't got around to it. Your first photo is correct with the seal lips pushing first into the housing. As Gerg says, internal oil pressure will push the seal lips against the shaft and housing for a tight seal. Next goes the backing ring with the curved side against the seal and the flat side against the circlip. Not knowing the correct orientation of the dust cover prompted me to get under my XF, brush away the cobwebs and have a look. It seems to me the flat side goes in against the circlip for the seal to clear the splines. I found this on Youtube posted one year ago, a HQ coupe with a professionally rebuilt Kirby Bishop power steering box: According to this, the orientation of the dust cover in your last photo seems correct. That's how it sits in my housing, the same as Gerg's last photo.