FELT DONUT BEHIND THE STEEL CRANK BALANCER

A small block used in a tractor, combine, forklift, etc....I'd like to see one of those as I've yet to see one. I remember seeing some early hemi's that ran pumps, and I've seen many small blocks in marine applications and airport vehicles, but, otherwise, I just haven't seen them other applications.....just 6cyl's. Any photos out there?