Thank you so very much for the help!

Mainly the horn screw: https://www.belmetric.com/4mm-metric-hex-bolts-4x7-coarse-c-533_535_21.html Only issue is country of manufacture...

Also, like to get an assortment of common sizes, as local and online only has Chinese/ Chinese hardware is horrible! Zinc coating is too thick and the threads aren't cut right or nice. Takes too much effort compared to the German yellow zinc hardware, to the point I like to replace some of the rusted Volkswagen hardware with yellow zinc. Plus, frustrating having to make a run around kingdom come to find something simple.

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Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.