Today's trivia that I've never heard of before, and only just learned of:

In the early days of motoring in the USA, one of the most popular cars was the Ford Model T. As were so many T's in comparison to other vehicles, the aftermarket manufacturers concentrated on accessories and "improvements" for the Model T. 

In fact, because of the vastness of this market, a new phrase was born: "fits to a T"

https://www.thecarburetorshop.com/Carbshop_virtual_museum.htm