How to fit 170mm Bafang rear hub kit on 190mm Mongoose?

[Grumpy old man]

Hi All, new to the ebike world....just got my Bafang rear hub kit from Aliexpress. The description said it would fit 175-190 drop--in. It measures 170mm, so question is how do I fit it to my 190mm Mongoose?

 

[Deleted member 4845]

You get a spacer kit, some bushings, just like everyone else who has dealt with this common problem for the last several years.