5/64 & 1/16th ring and max bore size

hi, total seal rings, use to have spacers for using a 1/16 ring in a 5/64 groove.
they do have spacers for, 1.2 mm and 1.5 mm for use in a 5/64 groove. many stock elim motors use spacers , because the 5/64 groove has to be maintained, rings can be any thickness. just food for thought.