1972 Other Mercedes Benz Models spark plug wire order

Electrical problem
1972 Other Mercedes Benz Models 6 cyl Wheel Drive Type unknown Automatic 72,003 miles

My brother changed the spark plugs & wires in my father's 1972 Mercedes 280SE on a 108 chassis (if that matters) and did not mark which wire went to where on the distributor cap. I'm trying to find a diagram that shows where to put what spark plug wire where on the distributor cap, while holding my father down so my little brother has a head start running. Any help would be greatly appreciated.