Unless your air filter is damaged, you never replace the element. It can be washed out with kerosene, or any suitable solvent. The manual mentions that the normal washing action of the oil bath keeps the element clean.
The parts manual gives the rivet sizes applicable to each piece of armour. I used standard 3/8 dome headed rivets in lengths of 1" and 1-1/4" length. The manual calls for 1-1/8 for most of the armour applications, but my hardware store onnly had these sizes to choose from, and the 1" worked great for most of the side armour.
The rivets going down from the armour angle iron to the fenders are 5/16 X 7/8" They are pointed downwards and peened flat.
Many just use carriage bolts to replace missing rivets. Watch for any bolts pointing down towards the track. They get very noisy with the continual beating of the track.
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