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

Rear Object Sensing (UD7)


Object Number: 2065188  Size: FS
Figure 2:

Rear Object Sensors (UD7)


Object Number: 2065190  Size: FS
Figure 3:

Rearview Camera (SVA)


Object Number: 2131926  Size: FS