Do i need to buy fender liners or just send it and stick it on anyways?
There will be a lot of rigging to be done with the 09 fender liners to make them work, it may not look right in the end. Also, I believe the grille gets changed out also, on top of fog lights, etc.
Basically, as RTP said you will need a lot more of the GV hatch parts than just the bumper. There was a previous member that did exactly what you are suggesting, and from my perspective it never looked right, at all.
If you want it to look right, you will have to spend the $, if you are not as worried then some rigging could be done. Good luck!