These are really tiny cars, the first time I saw a Chevron B16 at a Boston auto show I thought it was a toy car and not a real race car so I opted for a GT40.
That is a real Porsche 917 on the picture between the Toyota “minivan” and the For Edge.
Unfortunately I am out of the country at them moment and that information is on my home computer but I will reply as soon as I get home in a few weeks, that nut is to adjust the blade pressure on the windshield, I will look for more pictures and post when I get back.
I made three of those set up a while back but unfortunately they are all gone; the wiper arms came from EBay and were advertised as for a Boeing aircraft but didn’t have any part numbers on them.