Has anyone had good luck (and fit) with 3rd party like mats.com?

I've looked into Audi's own OEM offerings. Audi divides those which will fit S6 (Avant) and non-S6. Looks like S6 uses some sort of "ring" system and the non-S6 don't. Which is similar and will fit the RS6?

TIA...

P.S. Any luck for those looking for geniune, OEM RS6 mats which is available in Euro and elsewhere?

Just look at the floor mats, I'm 99% sure it uses the rings.

There was an earlier post on the RS6.com forum.
I contacted Marvyn in the UK and he can get them.
Hold on - 387 UK pounds for the set!! Too much for
my budget.