[m1911]

Seatbelts are a great example! And remember, they started out by only requiring the manufacturer to provide them too. Now, how many states have mandatory seat belt laws?

[El Gato]

And remember, they started out by only requiring the manufacturer to provide them too.

Actually they started out with requiring the manufacturers to provide anchor points for them. I had a '62 Pontiac Tempest (don't laugh, other than the engine, I liked the little beast) that someone had added aftermarket belts. They had the airline type "lever" latches, not the push button type most OE seat belts have always had.