1.9 TDI AFN engine / Cruise control

Hello everyone,
I would like to retrofit the cruise control (or GRA - Geschwindigkeitsregelanlage) to my Audi A4 1.9 TDI AFN model year 1997.
I already bought an original steering column lever from a 1997 AFN model.
The engine control unit has the part number 028 906 021 CE and should be an MSA15.5.
What I'm currently missing is the correct wiring diagram; I've found a few, but I'm not sure if any of them are the right one.
I found the plugs in the electrical box, see the picture.

If anyone can help me, I would be very grateful .
Best regards.
Veteran.

Here's a link:

http://kunset.de/xxx_shop_alt-636346346b363gv36v3b63v634v63346v5675v67575765376v363636363v3vghfd/Einbau/Audi/Audi%20A4%20B5/GRA/Einbauanleitung.pdf

Hi, thanks for your reply.
I had also found the linked PDF document, but unfortunately, I can't do anything with it because: 1. I don't have a wiring harness from Kunset, so the wire colors don't help me, and 2. there is a 10-pin white connector instead of a 15-pin connector in the electrical box.

Regards,
Veteran.