Is my oil cooler missing a washer (2 Viewers)

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Tulsa, Okla
About to install and noticed that it appears the backside of this oil cooler may require a washer or something. Can anyone confirm?
image.jpg
 
Could this brass washer be only part that goes there?

image.jpg
 
Onur
Negative. O-rings there, Jon.

90301-21176 x2

Those flat washers go on the bolt side: 90430-18027

Thanks, seems like something was missing.
 
Does anyone know the part that the oil cruiser bolts to has 4 plugs. Do those 4 plugs have "O" rings or do they just tighten down without an "O" ring?
 

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