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Here you go, found the part number here: https://www.rs6.com/showthread.php/20977-2003-RS6-Floor-Mats-and-Trunk-Liner

ZAW179005 BLK
Sounds like it’s the 4.2L A6 mats without the logo.

Comes up...

I have to imagine there is a part number for them that exists, but after looking them over thoroughly including the edges, literally the only recognizable part number is for the circular floor clips,...

I only have fronts (pictured)... you want to look for “1998 - 2004 AUDI A6 C5 Quattro 4.2L.” There will be a ton for the A6 C5 of that era, but unless they’re 4.2L they won’t match the floor shape. I...