After much research I finally found an aftermarket PDC kit which fits perfectly into the E53 mounts.

The SMART Park Reverse Sensor kits have the correct diameter sensors. I got it all fitted up for $400 which, considering the amount of work involved in getting the mounts attached, is a cracking price and much preferred over the $2,500+ price BMW wanted for the OEM kit.

It works flawlessly which ='s Happy days for me!!

Anyone interested in a factory looking PDC without the BMW price, this is the way to go I reckon!!

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2005 3.0d E53
Sports Pack