17.5 electric back wheel (Droylsden M18)

Hi there has anyone got a spare electric 17.5 back wheel for a chunky tyre.i have a electric bike but I'm desperate for a working bk wheel I can't afford to buy one the old one that was on bike got hit by a car a burnt motor out and damaged wheel I would be so greatfull if anyone could help me out I just had to get a controller box and get other parts fixed the bike is a allegro mountain bike many thanks