GMC Yukon Owner's Manual page 114

Use the following pictures to determine the latch plate
style:
Free Falling Latch Plate
2-76
Cinching Latch Plate
1. Put the child restraint on the seat.
2. Pick up the latch plate, and run the lap and
shoulder portions of the vehicle's safety belt
through or around the restraint. The child restraint
instructions will show you how.