RS5 8 piston Brembo question

Is there any year of RS5 (B8/B8.5) that included the caliper stiffener in the parts diagram below? My 2013 doesn’t have it but is drilled and tapped for the stiffener. My 2003 C5 RS6 has the identical front caliper but includes the stiffener? Maybe Audi determined that it was not required? Why is it in the RS5 parts diagram below?

The R8 rear brakes have one as well and people don’t seem to notice anything by removing them. No idea why some models have them and others don’t. If I’m remembering correctly, the TTRS and RS3 do not use the brace either.

I have these on my 2014 RS4 ! Funny some have them some dont ?

I checked out the Audi parts diagrams and they show the support but give now part #'s to purchase separately. I contacted Brembo and they were of no help either.