Those bolts are called Carriage Bolts, and you can find them at most large hardware stores, Home Depot, Tractor Supply, Chevies of the 40s, Classic Chevrolet. You can get polished ones at Cheviesofthe40s.com

Chevies of the 40s

Totally stainless

Mark-K Truck parts

Frank Cox
Cox Custom Cars


No better smell than that of fresh paint. I've been building and painting cars/trucks for 47 years. Not gonna stop now.
http://www.coxcustomcars.com/