I've put a couple of these mounts together over the years with a combination of rubber pads and just enough black silicone caulking to keep everything where I want it to stay. It probably wouldn't win many show points for originality but the mounts are still hanging in there years later.

1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup