Four 6 1/2", two on the back and two on the front doors, one subwoofer under the drivers seat, and two twitters on the front of the dashboard I believe.
See sources and related links below for all of the correct bulb numbers for the 2006 Suzuki Aerio.
The 2006 Suzuki Grand-Vitara has a 2.7 L base engine size.
The 2006 Suzuki Grand-Vitara has a V6 engine.
2006 E250 speaker size is 6x8"
a 6 1/2 speaker fits in the door of a 2006 nissan altima
6x8
6.5" (17cm)
6.5 inches
6-3/4
82MM is standard bore and 71.2MM is the Stroke
All four are 6x8 ovals.
6 1/2" front and Ext. cab door