firing order for 1968 280SE

Hi There
I have a 1968 Mercerdes 280 SE ( ex chinese embassy car )

Problem is when I was changing the spart plugs I got the leads mixed up and I do not know what the firing order is and where each of the leads goes on the distributor cap to the plugs

Can anyone help with a diagram of what the leads should look like when correctly positioned
??

Thanks

Mark

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