US B piston rings

So I am reassembling a US B that someone else took apart. I am to the point of installing the new piston rings which came with the tractor. All of the compression rings have a dot indicating TOP. The oil rings do not so does it matter which way they go on?
 
If oil ring outer edge is same on both edges / top and bottom you can put it on either way. If one edge is chamfered / rounded off put that to top of piston. DW
 

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