Here are the very hard to find 2" by 1/8th OMC piston rings.  Johnson part number is # 5-194.  These rings fit the following early Johnson models: A, A-25, A35, A45, J25,J65, OA55, OA60, OA65, F70,F75, 200, 210, J80, 100 and Model 110. These are new old stock aftermarket black iron rings.  They are BUTT END.  You will have to take a small file and notch the ends for the ring groove locating pin.   You can have a good set of rings for a little work at fraction of the price of factory rings if you can find them! Price is for one ring.  Look at the photos and email with questions.  Thanks for looking.