Hi guys and gals

My wife's corsa 1.0 3 cylinder has had the old rattle and shake from the timing chain for quite a while now and its even loosing power so i think its time i got it changed.
I rang vauxhall for a price on the kit and was told a price of £122.87 for the kit ( trade price as it aint on trade club)

The guy told me that the kit included the chair, tensioner, some gaskets and also the cam gears.
Do i have to change the cam gear or are they just trying to sell me something thst i dont need, Do they sell the kit without the cam gear and do anyone know the price without this.
Any help or advice you expert bunch of people