These spring plate bushes ensure that the rear suspension spring plate is able to rotate from a fixed pivot position. If your rear suspension is sagging it could be a sign that the bushes have perished or collapsed over time and need replacing. 
When re-indexing the rear suspension springplates we would always recommend taking the opportunity to replace these bushes as they have often never been replaced. 
Supplied in singles x4 required per vehicle
To be used with cover plates 211-511-225

Manufactured by Vibrasil an OE supplier to VW