They are 520s. I’ve also helped other riders convert a pair of 530s, EH500s and doing a set of A520 for the gravel bike. The old the M737 even work.
The Shi spindle’s additional width eliminates the need to cut into shoe soles as that width is between the pod and cleat centerline.
Bold face are SPD cleat pedal (click to link below to get the list for in more reader-friendly view)