(Pic) Parking lot item

For a parking lot display ; or photography ; or just to help prevent rolling replica cars on a shelf or display space, these items may be of use. In the photograph, from the bottom is : a section of white-painted wooden half-round trim ; a ceramic trim piece ; and another ceramic trim piece that may be more useful as a decorative half-round column.

These pieces are available at a home store in several sizes that can work for various scales. Naturally,  if one just wants to prevent a model auto shelf dive, nearly any size will work as a tire stop.