VW OEM parking sensors

[Mackenzie2576]

Hi all,
I am after some advice really because I'm lost and confused. I recently replaced my back bumper and this had parking sensors. My car didn't come with parking sensors at all. So I've purchased the loom and and the controller box (bosch 1k0 919 283 A) everything is connected up and the only thing missing is the part that goes into the middle of the controller for this to work. looking online the middle part is supposed to connect to the body module? I'm not sure and I'm hoping someone must've done what I've done before. My car is a VW golf 1.9 TDI match.
All help is appreciated.
Thanks 

[naskox]

What do you mean by middle part? Original mk5 has only rear parking sensors, so 1 plug for them, and 1 for the cables for power and ground, the middle one is not needed.