does vx 2 calais v6 have a stock amp

[bluevxcalais]

Hi ive just removed my stock sterio and replaced it with a after market system (nothing fancy). However the rear parcel speekers dont work now. I was told i needed an amp for them but the gregorys manual audio wiring section shows an amp as stock. Now i have little idea about audio stuff so i lookd in the boot and couldnt find one. Is the stock amp built into the stock sterio? Also if there isnt an amp any advice on what i would need to get the rear speakers running. I have just got the car and believe it has 8 stock speakers. The sterio sound great running 6 but will probably be a little better with the rears working. I dont want anything fancy as it only gets turned up for a short whe whilst im taking my kids around.
Appreciate anyones guidance please.

[WHYtheFACE]

I have a VT calais and the stock amp was hidden behind a panel on the left side of the boot, also with just using a wiring harness adapter on the other headunit all of the speakers still worked in the car. But i ended up ripping the parcel shelf speakers out as all they did was make the parcel shelf rattle.

[bluevxcalais]

Your right the vx stock amp is in the same place, appreciate the help.