Parkerized battery wing nuts for a 6 volt battery have a 5/16 – 18 UNC thread.
Fits:
EL 1936-1940
FL 1941-1964
J 1929-1930
UL 1938-1948
VL 1930-1934
WL 1929-1952
UOM: PK
Country Of Origin: TAIWAN
OEM Cross Reference: 66387-26,4409-26
Accessory Items:
32-0317 – Heavy Duty Black Ground Battery Cable Assortment
16-0037 – Battery Activator Filler Tool