Head Gasket Set - 4 small o-rings???

In the middle of a head gasket swap on a cg13 and noticed there are 4 small o-rings in the gasket set. What are these for? The rest of the bits in the set are obvious but cant think what the 4 o-rings are for?

Cheers, Matt
 
used to baffle me too, prob for other types of engine using the same gasket set?

tisn't the spark plug tube seal

scaled.php


...ooh just had a thought, could it be injector o-rings? na they'd prob come as 2 different o-rings per injector.
 
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