Stock application there would have been one of these on the right side (as if seated on bike) of the speedometer

CAD plated generator screws to install 3 brush generators with 1/4-24 threads to cases that have been drilled out for 5/16" bolts on 1936-57 Harley-Davidson Big Twins

Chrome plated acorn bolts

Features and Benefits - Direct Solenoid Operation: Allows you to start your motorcycle directly at the solenoid

#PSHC-274 5/16-18 x 1 length Polished Chrome Socket Head Allen Bolt - 10 Pack Subcategory_Whitworth Tools Stock application there would have#PSHC 274 5 16 18 x 1 length Polished Chrome Socket Head Allen Bolt 10 Pack. Made in Ohio, USA.