Oil pump chain, piston rings

Using Mr Tuttle's suggestion I decided to replace the oil pump chain with a new go-cart chain, the one to get has a '219' pitch and the one I got also has a joining link (some don't). The difference in the amount of slack between the old and new is minimal so maybe the old chain would still have been OK.
I was able to compare piston rings from an old 1974 civic 1500 (EC) engine and found they are an exact fit so it would appear that any of the early 1500,1600 cc EC,EG,ED etc engines (74mm bore) use these rings and they seem to be readily available in std and oversize