Image Item No. Description By  3684  Slope 75 2 x 2 x 3 (Undetermined Type) Catalog: Parts: Slope 21  3684a  Slope 75 2 x 2 x 3 - Hollow Studs Catalog: Parts: Slope 3  3684c  Slope 75 2 x 2 x 3 - Solid Studs Catalog: Parts: Slope 15  3685  Slope 75 2 x 2 x 3 Double Convex Catalog: Parts: Slope 50