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side panels were all the same for square hooded models, 2511 to 6718. 6911 panels (used untill the 1992 model) are still for sale but they dont have the headlamp supports pressed into them.
The difference is that the fuel tank sits back on a 4712/18 and the battery is between fuel tank and engine, with a little spacer added between tank and side panel, which is flat sheetmetal so easy to make your own. The four cylinders had a fuel tank beginning right behind the engine so side panels and fuel tank allmost touched, hence the same panels were used for 3 and 4 cylinders.