BOSE and Co.

Hi,
today I once again had two baffled technicians in the car connection of a blue point radio with two preamp outputs to the active boxes of the Bose system: not possible, there is a slight problem with the connections (ISO 2x5 pole of the Audi as connection for the radio on the one hand and Mini-ISO (?) with something about the 15 poles on the other).
Question: is there an adapter and where? If someone has experience with the connections in the V8, how do you get a clutch for it and how is the occupancy?
There was a talk here about a Dietz or Diehl or Deal or Dell or so adapter that could do that -- does anyone know where that is?
If the whole rattle doesn't work, then I'll get a new old Gamma II CD and feddich at Audi for a pig money! Is better from the point of view of originality anyway!
Thank you and warm greetings,
Konrad