Retrofit PDC? and 17" Avus alloys

[green A8]

I'm slowly rebuilding a 1996 D2 4.2 as a bit of a hobby.

As this car is blessed with a 'universal' loom I've slowly been adding to it's spec. Buying parts from this those great folk who are based at Stockton-On-Tees. Fantastic service, rapid delivery ect Shame I've probably spent more on bits than the car will ever be worth. But that's life! Up to now I've added a rear blind and side blinds. A nice new rear seat that has heating and electric headrests, and a few other items. On the 'to buy' list is a Solar Sunroof 'kit' and maybe a few other bits and bobs.

So, what bits do i need to retrofit rear PDC? I recently spotted on ebay in the Prestige Motors shop a PF rear bumper for sale with sensors and loom included, I assume that other parts are needed to complete the retrofit? If so what please advise. Can the front end also be upgraded?

I would, could pick up the phone and ask the experts, but then that blasted Solar sunroof and that lovely alcantara headliner not to mention many other nice must have things that would vastly improve my humble A8 would end up being bought. and my credit card would self destruct.

Besides that I just can't afford a divorce!

I was offered a set of 17" Avus Alloy wheels, in very good unkerbed condition, which I'm told that they will bolt straight on to my car for a bargain price (£90.00 for five wheels). Now, I always thought that A8 Avus alloys were all 18" Or, have I gone into 'thick' mode and got it wrong (again)

Thanks for reading this I look forward to reading any replies.