Parkerized battery wing nuts for a 6 volt battery have a 5/16" - 18 UNC thread.

VT No: 12-0538
OEM No: 66387-26
Parkerized battery wing nuts for a 6 volt battery have a 5/16" - 18 UNC thread.
Fits:
WL 1929-1952
J 1929-1930
VL 1930-1934
EL 1936-1940
FL 1941-1964
UL 1938-1948
UOM: 10 - PK
Country of Origin: USA

Material: Steel
2018 Catalog pages: 701

2017 Catalog Page: 703

V-Twin Manufacturing Part Number: 12-0538
Manufacturer:
Manufacturer Part Number:

Harley-Davidson & Indian OEM Cross Reference Part Numbers: 66387-26