1965 Dodge Dart Charger

Today the corbon clamps arrived. They look good on the vacuum hose for the Bendix check valve.

However I found the nuts and washers for the rear bumpers. The bolts arev restored but the nuts seems impossible fo find.

They are 11/16" head with 3/8" thick. The nut has a special profile on the bottom. They should be black phosphated.

The washers are 0,15748" thick and 1,26771 outside diameter. Inside diameter is 7/16". The washer should be silver zinc.

My question isif it is possibleto get these nuts and washers from US? Any help is gladly appriciated. Thanks FABO