The problem is very seldom the coils on a /6 machine. The VW coils will work only if they have the correct resistance. Not all do I'm told.
Right side not firing? Check the plug wires, plug caps and spark plugs. Spark plugs are non-resister. Wires are non-resister. Plug caps should have about 1000 Ohms rsistance.
Ignition points are a maintenance item. You need the BMW part.
Condensers go bad.
When you get it running check for uneven firing. The tip of the cam can be bent and causes one side to fire way later than the other side. You have to look at the timing window with a timing light while engine is running to see if both sides fire evenly. If it appears there are two firings or a ghost image you have found the problem.