Broken top spring platform on Bilstein damper

Whilst changing brake pads at the weekend I noticed that the top spring platform on the damper has sheared on offside rear. It�s still holding together for the moment but was advised to get it replaced asap, it was also suggested there may have been a recall on this, car is a 04 plate so don�t expect any warranty replacement but I was told it might be worth pursuing if it was a recall or recognised fault. Has anyone else had a similar problem.

Also can the top platform be replaced without changing the damper or do I have to replace the whole lot?