Dual lip axle grease seal with spring. 2-7/8" OD x 1-3/4" ID x 3/8" thick. This grease seal is a very snug fit but it is the correct seal. Removing the thin layer of paint on the edge of the seal will make it easier to install but is not absolutely necessary.
This grease seal is for 5 on 5-1/2" lug hubs with #2585 inner bearing and #1380 outer bearing. It should work on any hubs with these same specs and bearing #'s.