I mounted this on my 2018 Radwagon once, took it for one 10 mile ride, and decided against using it because the stock controller is enough for my needs.  $180 plus actual shipping costs from NYC

https://boltonebikes.com/products/2019-radpower-upgrade-kit-with-tail-light


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I have a Radmission and this basket.  When you have it oriented length-wise it extends to just beneath the saddle and just barely past the rear wheel.  It works but the only caveat is that you can't lower the seat all the way before it hits the basket. 


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