GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Driver Seat Belt Buckle


Object Number: 781067  Size: MF
(1)Seat Belt Buckle
(2)Seat Belt Switch Connector
Figure 2:

Passenger Seat Belt Buckle (AL0)


Object Number: 1459522  Size: MF
(1)Seat Belt Buckle
(2)Seat Belt Switch Connector (AL0)