They got a lot of brass
A 54-p catalog lists stock cast bronze bushings and sleeve bearings, tubular and solid bronze bar stock, large diameter bronze tubes, bronze plate, aluminum bronze bushings, powdered metal bronze products, and metric sleeve bearings. Sizes range from 3/8-in. OD X 1/4-in. length to 6-in. OD X 9-in. length.
American Sleeve Bearing