First of all let me just say Excellent thread!
I stumbled across the thread while trying to remember a car dealership we used to pass on the way to visit relatives in the then relatively new suburbs. The dealership was on Joy rd. at Beech, n.e. corner. I rember a round showroom with a little green car in it. My 85yr old father thinks it was a Toyota dealership. Econ you mentioned overseas motors was on Plymouth rd in Livonia and had a round showroom. Are you positive of the location?
Anybody remember what was on Joy / Beech in the late 60's early 70's?