Yep, I'll second that. The square shanks are pretty long for an automotive application. Could even be old door handles from a house or business.
Something coachbuilt, HJ milliner used something similar here in the uk. Long shank passed through the ash framed door.
Yes, it shows two lefts and two right side. ..and the shanks are twisted/bent from the old wood frame doors when they had loose wood and were binding.