Your rack shows up in a October, 1962 Hunter ad. It is a small picture, but it matches your rack, except the area that is yellow shows up a gray, probably the was dune to better show the pieces of equipment that should be on the rack. The red bar does not belong on the rack, it is some other picece of equipment. What should be on the rack is the "NEW (1962) MECHANICAL WHEEL ALIGNER THAT REALLY DOES THE WHOLE JOB!" incidentally, both Hunter and Lincoln"s offices are about two miles from where I live here in St. Louis.
Thank you Randy. Also, I want members to know I had to post a asking price. A starting point from some similar but not identical examples. If you would like this piece for your collection and are prepared to conduct business you can drop me a line.