Technical Ducato X250 radio wiring

[pastori]

I'm installing a Can-bus alarm system in my Ducato -08 camper. The pre-owner has installed a new radio and contacted only power and speaker lines, rest of the cables are cut off, no ISO-connector available. There are 8 cables without any markings and I need to know which is Can L and Can H for the alarm. I checked eLearn and I know that ISO-connector pin A1 is Can H and A3 is Can L but there is no ISO left, the only clue is the color of the wires, they should be pink/black for A1 and pink/white for A3, but my colors don't match it. Are there different sets of wiring for radio? Any tips to locate those two wires?