Enertion modified trucks


hi everyone!
I bought the modified enertion trucks, in order to use them with the dedicated wheel pully and motor mount.
I’m gonna use 1 motor on just one side, but the trucks are modified from both sides - how do I fill the gap one the other side ? a spacer ? another bearing ?


Saw some people use a spacer successfully, cheapest option.


Just use another bearing spacer on the other side.


Other solutions? Someone who already tried it?


This is the solution used for Enertion boards, so this is technically the actual solution.