They look ok without bumpers. I would be afraid of body damage without a bumper. MY 39 STARTED IN GEAR WHEN I WAS USING THE BUTTON ON THE SOLENOID. THE CAR RAN INTO THE SNOW BLOWER AND BENT THE BUMPER, THE GRILL AND THE BUMPER BRACES.
The snow blower handle bar was bent.
There is always the other driver bumping into your car.