k member question

I need the attaching nuts/washers to install the lower control arm to the K member. I bought my car in a hundred pieces, and these nuts weren't with the car.
Does anyone know where I can buy a set? I don't know if washers are used or not, nor do I know what the nuts look like; lock nuts, hex nuts, etc.

Any help will be greatly appreciated.

George
69 Dart Swinger 340