GMC SIERRA 1995 Manual page 61

Before replacing any safety belt, see your dealer for the correct part number.
You'll need the model year and model number for your vehicle. The model
year is on your title and registration. And you can find the model number on
the CertificatiodTire label of your vehicle. See "Certification/Tire Label" in
the Index.
The model number on the replacement belt may be listed on the safety belt
you want to replace. Pull the lap belt a l l the way out to see this label. If
there is no model number listed on the safety belt, see your dealer to make
sure you get the correct part number for the replacement belt.
1-45