Currently restoring fuselage on an 8KCAB. I use the parts list and diagrams daily, but I am not an experienced mechanic like Bob and others on here. Before I started, I made a list of everything AN and ordered from Spruce. $500 worth of nuts and bolts. When I start assembling an assembly, I grab all the new hardware from my bin and lay it out as shown on the parts diagram.
Most of the stuff in this photo looks like control system stuff. Short clevis pins are used to fasten the connecting rods for the throttle, trim, and brakes. Also used for the tail brace rod ends. Short clevis bolts are used for the rudder pedal connecting rods and the various control line shackles. Long clevis bolts for the tail surface hinges, though I believe the earlier aircraft used long clevis pins instead.
As a general rule from what I have seen, control system parts are castle nuts, some of them full size and some half-size shear nuts. Other lock nuts in the fuselage are nylon. Lock nuts in the engine compartment are metal.
Most bolts are AN3 or AN4, with a lot of #8 and #10 machine screws. Anything bigger than AN4 is major structural stuff: struts, engine, etc.