W204 impulse ring

[Pedrostar88]

Hi I had my W204 at Mercedes for a recall and got them to diagnose ESP fault. They said both rear impulse rings are needing renewed. My question is how much would you expect a local garage to charge to do both. I’ve ordered both rings from eBay for £30. I belief it is quite an awkward job so was wondering how much to expect for them both to be replaced?

 

[BigJase88]

Hour a side.

Just from experience of doing myself on a BMW. Can't be too different