Flat U-Bolts and Vintage Bolt Source

Is the a special name for U- Bolts that have the flat surface on the inside ?

Also is there a good source for Older Nuts and Bolts ?? Been looking for good old fashion Machine Bolts ,,cheap junk hex seems to be all anyplace carries.

 

Square maybe?

 

If you can find a spring shop where there's still a blacksmith they make their own, and certainly could flatten the inside radius. That said, the only spring shop with a blacksmith left in New England to my knowledge is Palmer Spring in Providence, RI.

 

Try St.Louis spring,had them make up some main leafs for me.The seemed to have or know about all things related to springs,u-bolts.

 

Try Nacewicz bolts...you can find a crude webpage to order a catalog. His selection of early Ford bolts gives you a pretty good selection of nice looking stuff that does not scream "Home Depot!"