On Monday, August 8, 2016 at 5:30:07 PM UTC-4, Neil Muxworthy wrote:
Anyone know of a good source to order the black rubber piece that is part
of
the Schweitzer tow hook?

Look at McMaster Carr supply. They have a large variety of rubber products. You will find the rubber you need for your Schweizer(no t) hook.
Good luck
UH