2nd gen Rear Brake Low Frequency Damper??

[ctgottapee]

I saw Raybestos offer this part while looking at brake parts, and that ACDelco offers likely a rebadged version.
I checked my rear brakes and they don't have one; this didn't come standard on rear brakes did it?

Anyone have any experience with this sort of part or put one on their 2nd gen rear brakes?

http://www.amazon.com/ACDelco-18K2268-P ... 00B4KW7A6/
http://www.amazon.com/gp/product/B00ABY5FMI

[ImUrOBGYN]

I wouldn't worry about it unless you need it. Can't see why you would and I'd be surprised if your Vibe came with those stock. Perhaps, someone with a MKII will chime in.