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I am fortunate to have inherited a 08 427r. As I was looking the car over I found the tie rod ends to be loose. As I was looking at the part to locate the brand and part number I found these were missing.
That's a bumpsteer correction kit, not an OE outer tierod end. I have no idea whose, or whether it was installed by a previous owner or put there by Roush.
I assume that the looseness is all at the rod end rather than between the stud and the steering arm portion of the knuckle.
I'm thinking that as far as function is concerned it wouldn't matter whose bumpsteer correction pieces you replaced it with. All that really matters is getting the ball at the same height relative to the steering arm (measure carefully, and assuming that the bumpsteer was corrected properly originally it'll be at least close). The shape of the rod end and the inclination of the rest of it all don't matter because the geometry is defined by the ball on the knuckle end and the joint inside the rack on the other. Not what the pieces in the middle look like.
I'd replace both sides on the idea that if one side is clearly worn the other side may not be far behind. Then it won't matter at all whose kit is in there now.