new design of tube damper from ARC ?

[TOGA]

Hello there,

After 7 years of service and 8000+ hours on my Ref40 preamp.
Now it is time for a third set of 6H30. Tube dampers that came with it since
2010 are now brittle and torn apart. I ordered new sets from ARC dealer and
I was surprised to see that they were in new type, just a single ring with circular cross section. pretty much like a donut. the old type was like a double ring.
Even on picture of the latest Ref160M 6H30, it still has that classic double ring type dampers on them. But my ARC dealer assured me that what they sent to me were from ARC factory and original, but new design.
Any idea about this ?

Thanks
TOGA