Difference in power steering pumps

[Dobby]

I need to replace mine on my C200K (its a 2003 model) When I'm looking for a replacement there are two types that I can see that are used for my car. The two variants are one pulley is solid and on the other choice of pump, the pulley has holes in it (looks like an alloy wheel) I know I need the solid pulley type on mine, but just wanted to know why there is two types for the same car. They both state that they are for W203

 

[Aussie Baz]

Hi Dobby, I just replaced mine on a w211, those holes are to fit your socket with a extension to undo the front studs that hold the pump. A tip from me, buy a well known brand pump, not a cheap no brand name pump-- unless you want experience in how to remove & replace pumps. cheers baz