Edit: Thank you very much Valdelis, I only saw your reply after I posted.
I'll get them all checked out so, I'll stear clear of powerflex I think.
So I think these would probably be replacement bushes from powerflex
http://www.powerflex.co.uk/road-series/product-details/Rear+Upper+Control+Arm+To+Chassis+Bush/1882.html
and
http://www.powerflex.co.uk/road-series/product-details/Rear+Upper+Control+Arm+To+Hub+Bush/1883.html
or these would supposedly fit as an upgrade
http://www.ecstuning.com/BMW-E82-128i-N52_3.0L/Suspension/Control_Arm/ES2622633/