Need a little guidance guys.

Did my own install of the Stillen cat back exhaust yesterday. Car is a G37 sedan with the manual. Love it. Problem is, there are four of the rubber vibration dampers on the stock exahust you are supposed to transfer to the new exhaust.

I could only get the back two off of the old exhaust, so right now I only have on the two that attach next to the mufflers.

Question is:
1) Does it even matter if I have the ones on between the cats & resonators
2) If it does matter, is there a site I can buy two replacements ones for cheaper than the dealership will sell them to me.

 

I installed a Y Pipe, and never transfered them.
No unusual vibrations here.