Zboard 1 belt size

Does anyone else have a zboard 1 with urethane wheels? I need to know the belt size to replace it. Afaik, its a 5M-15 350 on the older wheels, and 5M-15 ??? on the upgraded urethane wheels. The belt is usually marked, but mine’s worn out and can’t read. Thanks!!

I found out the urethane wheel ZB1 takes a 5M-15-330 belt. Thanks all!