Is this the one that sits around the wheel spacer between the bearings? Doesn't do much apart from support the spacer as far as I'm aware. Nothing to worry about, but nice to have it fitted. Been superceeded by the looks of it. Yambits have this sort of stuff usually.
Thanks LC_BOTT but that's not the collar I am looking for. Without it the wheel spindle would not be supported by the bearing. I only noticed mine was missing when I was watching this excellent video on wheel bearing replacement.
If you watch the video you can see the collar being removed between 2:00 and 2:10 and pressed into the bearing at 11:31 and reinstalled in the wheel at 12:00.
Again, if anyone can help with locating a replacement 2R6-25377-00 that would be great.