Headgasket set, what are these o-rings/seals?

[Devilmans Hand]

1986 4runner 22re

I'm changing out the headgasket, timing chain, and whatnot.
In the enginebuilder HG gasket kit i have a couple new rubber o-rings or seals that i don't remember taking off before. Maybe something with the crank/oil pump? I was thinking maybe one of them goes on the thermostat, but there wasn't one there when i removed it before. none of them are the front seal on the oil pump, that is already installed.

inside view

thanks for any guidance.

 

[fjfodee]

I could be wrong, but I think that #1 is for the oil filler cap.

The others look like thermostat gaskets.

 

[Devilmans Hand]

thanks. would have never even looked at the oil filler cap.
the other ones fit on the thermostat too.