Damn that’s cheap for dual. Usually it’s 
What is the lenght from axle center to end of motor arm?
You got a very good deal from the factory 60$ dual with support bar, idler and anodized 
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71.4mm - 75.4mm center to center.
Also note that due to the idler, small movements to the center to center distance can change overall belt pitch greatly, so not a lot of stroke is needed.
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Also, I will custom print a belt cover for every order so that it fits your specific belt and pulley setup with minimal gap.
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