Does anyone know the width of the 2 metal "stands" on the MINI headrests?

As some of you may know, I am looking for some headrests here.

I was thinking of buying some off eBay, but there arent any for a MINI cooper. I did find some for a Hummer that I have seen in person. The leather is *close* to the same. I asked the seller what the width was and I am waiting for a response.

I dont have my MINI with me for a while, so I was wonder if anyone with a tape measure could take a look.

Thanks,
w

 

Someone heres gotta have a tape measure.

 

4.25" center to center.

Why?

 

Thank you very much! The reason? I want a backup pair for this