They are also called spring knuckles ...

Make sure you located them where they won't rub against anything.

I install two on each side of the 300's rear springs after being sent the wrong replacement springs .....

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)