AMAZING!!

Having just read an answer to a post, I learned that there are 2 small bushings on a small extension to the rear lower control arms, which relate significantly to vibration through to body.

Does anyone know about this? I looked now under the car, and I see where these metal extension-stops are. They have about a 1/2 inch of space between them and the two metal extensions connected to the upper part of the chassis.
In the lower pieces, there is a hole - could be to secure a rubber bushing. I have no bushing at all at either side, and I detect that there ius a bit of clean metal on the upper piece where it may be contacting metal-to-metal with the lower piece. Am I missing rubber there?????
Someone- HELP-please advise. Thanks.