Thanks for the enquiry. We don't sell the Electronic Actuator for your 525d separately but we do either sell a fully reconditioned turbo with the Electronic Actuator set up or we rebuild customer turbo. We would need a part number to confirm which turbo we are talking about but as a guide I think the one you have is likely to be £425+VAT (£510.00) for a fully reconditioned turbo with 2 years warranty on the build of the turbo and no mileage limit on the vehicle. Whichever way you decide to go with this remember to get the Engine breather assembly checked out as they commonly get blocked and cause issues with the turbo. Also advisable to assess the condition of the oil feed and drain pipework as this will also have an impact on the turbo. Hope this helps.
If you need any other info get back in touch. If you'd prefer to speak with us give us a call on 01376 503350.