Optibelt-ZR 503AG

Looks like 10mm is the widest standard belt I could find in that tooth count. You might just buy a few of those and
change them out more often. I only spent a few minutes looking on Aliexpress- you might have better luck

Emco may have had that belt made for them, or they found a large quantity of that size for cheap and designed around it
Seems MXL is becoming a less-used format- not recommended for new designs
 
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