2004 GMC Yukon Owner's Manual - Page 64

Yukon models: A child restraint with a top strap should only be used in the second or third row. Don't use a child restraint with a top strap in the right front passenger's position, because there's no place to anchor the top strap. Do not secure a child restraint with a top strap in the right front passenger's position or in the third row driver's side position if a national or local law requires that the top strap be anchored, or if the instructions that come with the child restraint say that the top strap must be anchored. There is no place to anchor the top strap in these positions. An anchor loop bracket for a top strap is located at the bottom rear of the seat cushion for the center seating position in the third row. Yukon Second Row Seat 1-58