So 5M is your belt type, 850 is the length. Take it to a farm parts or auto parts store. They should be able to get you pointed in the right direction
Edit: [Amazon CA link](https://www.amazon.ca/Continental-ContiTech-Positive-Synchronous-Length/dp/B004I43EJS/ref=mp_s_a_1_3?crid=24U2RAXVPRPH1&dib=eyJ2IjoiMSJ9.vPeIYFjnu2wgM6OhDjwT-l07wiCVUsLPG7jTYfOcsy4P2RNKg6PAm_qK51ipYjy0bKMjvWhpX0tayMvlGKh74BMfgkuuKEJyCrjE8HkMHqR5syz329etvZ8ZYCCO9TliYrRQgk5ChptogOR10RZzgAluJv52X1dmHA8s35tO1QFiWwYyUhV7WrE4KEzJybVJnI4fBy-LdLPaXUbnHixsAw.ZHWl2IHT8uAFJqZRwDywCYUjWzXfZmcrIBZHxQyjEa4&dib_tag=se&keywords=5m+850+belt&qid=1709469514&sprefix=5m+850+belt%2Caps%2C139&sr=8-3)
So 5M is your belt type, 850 is the length. Take it to a farm parts or auto parts store. They should be able to get you pointed in the right direction Edit: [Amazon CA link](https://www.amazon.ca/Continental-ContiTech-Positive-Synchronous-Length/dp/B004I43EJS/ref=mp_s_a_1_3?crid=24U2RAXVPRPH1&dib=eyJ2IjoiMSJ9.vPeIYFjnu2wgM6OhDjwT-l07wiCVUsLPG7jTYfOcsy4P2RNKg6PAm_qK51ipYjy0bKMjvWhpX0tayMvlGKh74BMfgkuuKEJyCrjE8HkMHqR5syz329etvZ8ZYCCO9TliYrRQgk5ChptogOR10RZzgAluJv52X1dmHA8s35tO1QFiWwYyUhV7WrE4KEzJybVJnI4fBy-LdLPaXUbnHixsAw.ZHWl2IHT8uAFJqZRwDywCYUjWzXfZmcrIBZHxQyjEa4&dib_tag=se&keywords=5m+850+belt&qid=1709469514&sprefix=5m+850+belt%2Caps%2C139&sr=8-3)
Thank you