Adrian-canterbury

Hi can anyone help me to understand which bearings would fit the rear of a circa 2010 Oset 16 24v. The rear bearings have just fallen out and they were the semi encased push bike type ones - shot to pieces now. Fell out when i replaced the sprocket and chain. But i would like to know if the current size bearings for a 16 would fit or does anyone know a hack or suitable replacement for the 24v 16. Keen to get the bike running again. Thanks in advance for any help anyone can offer