Part Description
Fits the 3/4" bore Wagner-Lockheed master cylinder on 1958-1969 FL models, Master cylinder dust boot, Cycle Pro (OEM 41764-58)
Text excerpt from the catalog:
Top cover gaskets and seals can be used with DOT 3, DOT 4 or DOT 5 brake fluid but you should always stay with the same brake fluid type as the three types are chemically incompatible.