Refurbish parking aid (pdc) properly

So now I'm asking my question here again. (MotorTalk)

Hey, guys!

Would like to retrofit something like this in my '96 A8.
Now I have already used the search and also read a few posts but I am not really further yet.

I found some parking aids on ebay for retrofitting, but good advice is expensive, which is the better one and is more reliable? And I don't like those parts that are standing up.
I've already thought that I'd turn this edge off what they all have and then stick it in the plan, another way would be to use these systems with the original. Sensors
To combine from Audi, if that's possible? And since you asked.

Keep going. Probably the best solution is to install the originals.
Somebody can share it with me. and often call prices.
What do I need for this and then radio it in my
'96s? Do not want to connect this pdc to the instrument cluster undisturbed (too much effort)

So, I'm done. Now POSTET!

Thanks already and I hope for productive answers