(2) Rockwell American Accu-Lube Grease Caps. Fits Most 2,000 lb to 3,500 lb Axles. Removeable Rubber Cap for Easy Access to Grease Fitting. 1.98" Outside Diameter. These grease caps are slightly larger by design. You will need to smack into place using a wood block and hammer or rubber mallet to prevent denting the cap while installing.