Piston Size

[Peyote]

Hi, I've just got a 1972 XS650 and have torn the motor down and checking things out. I've read the forums about piston ring size, but can't see anything about the numbers I've got.
Basically what I'm asking is what size these are. The number on the piston crown is a bit unclear, but I think it is 962 and under the position arrow is a 1. Can anyone tell me what size rings I need? Many Thanks

 

[peterg]

Don’t know what the 1 means but the diameters are 74.962 mm. Stock 75 mm nominal sizes.

 

[Peyote]

Thanks