Makerbot Replicator 5th Gen Replacement Belt

So the belt on the left side of my y axis on my printer is all chewed up from usage over time. Wondering if anyone knows where I can find a replacement part for this.
I found this website but their belts are out of stock. From here it gave me the part number 2MR-09 but not the length of the belt needed. I found what appear to be the right belts on a different site if I am able to find out the length of my belt.
https://www.fargo3dprinting.com/prod...-5th-gen-belt/
These are the belts that I am assuming would work if I found out the length I need.
http://www.biedlers-belts.com/synchr...-wide.html?p=1
Thanks guys!

can't you simply buy a length of standard belt and just cut it to size ?
even something as simple as a small cable tie can be used to lock toothed belt into itself for a fixed loop.