Rock Auto lists Raybestos rear Brake caliper Dampeners for use on LS400;

https://www.rockauto.com/catalog/moreinfo.php?pk=3766299&cc=1356083&jnid=389&jpid=0

Anyone install this on their LS400?
Any difference?



Eliminate Low Frequency Moans, Groans and Squeals<br/>Low frequency noise cannot be suppressed using traditional methods like brake grease, pad shims or Quiet Clips™, which only work for high frequency noise.<br/>Effective solutions for the problem applications listed below are Raybestos low frequency dampers. The dampers are specially tuned to the frequency of those specific applications to help reduce the low frequency noise occurring in the rear calipers.<br/>Raybestos low frequency dampers incorporate a

 

THis is a somewhat universal item that does not specifically apply to the LS400. It's for certain vehicles that are known to have brake moan/groan issues, usually domestic pickup trucks.