Can anyone identify the model year/production year of the two different length air cleaner fastener bolts?

Left pair style is 81 mm, right pair style is 78mm

Also, can anyone identify the model year/production year of the two different length air cleaner extension bolts?

Left pair is smooth sided, right pair is notched

Thank you,

Keith

Edited July 7, 20222 yr by zed2

If it helps I created this sketch of my 7/70 car for another discussion.

 

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Edited July 7, 20222 yr by CanTechZ