Auto body repair & detailing: inner wheel well plastic, 2004 yukon xl, splash shields

Question
What is the plastic liner inside the wheel well on the rear passenger side of a 2004 Yukon XL called.  I'm trying to look it up on the internet and for the life of me can't find the rear only the fronts and they are called inner fender liners.

Answer
ROBERT...... THE INNER WHEEL WELL LINERS ARE NOT SOUGHT AFTER PIECES AND CAN BE DIFFICULT TO IDENTIFY. YOU ARE CORRECT IN THAT THEY ARE CALLED INNER QUARTER LINERS OR ALSO KNOWN AS SPLASH SHIELDS.

YOU CAN CALL YOUR GMC DEALER PARTS DEPARTMENT AND ASK THAT THEY FAX YOU A BREAKDOWN OF THE REAR
SPLASH SHIELDS....CIRCLE THE PART NUMBER AND FAX BACK AND ASK THEM WHAT GM IS NAMING IT.