5X4 Yamaha DT125 piston circa 1982 NOS

We believe this is a Yamaha DT125 or a YZ125 piston from the 1980s - if you can help correctly ID it, we'd love to hear from you. It looks very similar to a YZ125 5X4 piston, but it has 2 ringlands, rather than the single ring on the Motocross bike. Size 97, cast with 53702 on the inside of the skirt. Part number to be confirmed XXX-11631-00?