Is there a pinch bolt using a 2.5 mm allen key or a phillips screwdriver on the nds of a rear hub or one side if it's a front that locks the adjustable cone in place? If so, it's likely the same as Campy's component hubs from that period and uses 15x5/32" balls per side, front and rear, with the balls held in reusable plastic retainers. New retainers are still available if these are damaged.