I wouldn't call it newer version. The one on the left is the Ford ERMM which is the upgrade. As I understand it this is also standard on the ST.In the photo, the one on the left is the newer version, correct?
Short of crawling under the car is there a way to tell which RMM a 2015 might have?
Before realizing that some later models may have the newer version I have ordered the insert from fswerks for the old style expecting it would be a good first volley.
I guess I'll be getting out the jack and jack stands to take a gander at it and see whether I'll be needing it or not.
If by old style you mean the original as seen on the right in my picture I would stay away from that. ERMM=good, original=bad.
As for the prospect that any of the standard Focus's came with the ERMM, I think that is folklore. No reason for Ford to come to their senses on just this part.