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If you look at the deck surface of the cases it becomes really obvious, there is a recess machined into the opening for the cylinder spigot where the large base O ring goes, and then each cylinder has two dowels but only the downside dowel has a recess machined around the dowel for the little O ring.
 

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In other words you would recover four used O rings in this area, two big O rings, ie one from each cylinder spigot, and two little ones, ie one from each cylinder downside dowel.
 

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They did change this at some time in the past.
I remember HD top end gasket kits where the stock included head gaskets were intended to be used without the O rings.
Don't remember when as I always threw the stock gaskets away, but it has been quite some time, ie even before the 06's came out.
 
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