When installing the 53 tooth chainring what crank do you use on the left side? Can't be the stock one because that doesn't line up right and can't be the LitePro because of frame clearance.
I noticed left pedal crank arms can be either square or diamond shape to attach to the bike. Can you look for the Pro-wheel left crank; but, in the opposite configuration? I can't remember what the standard configuration of the Rad ebikes?