“Aftermarket”! ... think aftermarket! ... :-) ...
Lol! Actually, I was just having a little fun :) Chevys of that era, both cars and trucks had a lock position and a off position. If left in the off position the key could be removed and it would not be necessary to use the key thereafter until the key was reinserted. The last Chevy that I owned with this feature was a 63. I think, but not sure, it was the last year for this feature. I liked the feature as it was handy. But, alas, a different era. We never locked our house either. I’m not sure anyone even knew where the key was :)