Timing belt question

[TSITurbo95]

First off, when I replace my timing belt, should I just replace the timing belt, or should I get the kit which as the timing belt, tensioner, tensioner pully and idler pully.

 

[92AWDHX40]

Get everything kit or piece by piece, its just that simple replace it all.

 

[TSITurbo95]

Ok. Thanks.