750 Twin Rubber Fin dampers: use 6 or 8?

The 750 twins have the small round rubber vibration dampers in between the vertical fins on the head just above the spark plugs. I have one rubber left on each side, so I was going to order new set.

QUESTION: I see four gaps between the five fins, so why does the parts drawing only show three rubbers on each side?

Shouldn't there be one in each gap?

Another question: do they actually do anything you can feel?

I believe they reduce the amount of vibration in the handlebars from the harmonics of the engine. Maybe there is another purpose, but i wouldnt know..

I guess I should get some. Still can't figure out why they use three when there are four gaps between fins....?

find an old junker tow truck that has an old sling on it and cut off a chunk of it,then you can make all of em ya want! :laugh:

Because 2 isn't enough and 4 is to many