GMC 1995 Suburban Owner's Manual page 62

Top Strap
If your child restraint has a top strap, it should be anchored. If you need to
have an anchor installed, you can ask your GM dealer to put it in for you. If
you want to install an anchor yourself, your dealer can tell you how to do it.
Securing a Child Restraint in a Rear Outside Seat
Position
You'll be using the lap-shoulder belt. See the earlier part about the top strap
if the child restraint has one.
1. Put the restraint on the seat. Follow the instructions for the child
restraint.
2. Secure the child in the child restraint as the instructions say.
1-42