Wolf.Dose

Ulf,
your pic is a Magirus 168A11 FL or a 110-17AW. The first is from the same period of time as the 1017A.

Anyway, the price of 21000$ seems to be quiet high. You do not know the condition.
By the way, 24 V is the standard Voltage ratio for european trucks, so that are mass production parts (28V/34A alternator).
The engine type of the 1017 is correct OM 352 A.VIII, bore 97 mm, stroke 128 mm, displacement 5638 ccm (rounded according StVZO), 172HP/127kW at 2800 rpm, max torque 55 mkg/540Nm at 1600 rpm, measured maximum speed 87 km/h (54,07 mph). The OM number is Tdv 2320/054-12.
Greetings
Wolf