This is a new old stock pair of Trico brand and part number TAU-12 replacment wiper blades (these replace Trico number TAU 11 and TAU 12).  These are the type that have a slide attachment where the arm connects so that you can use this 12" blade for both 11 and 12 inch applications with flat windshields.  These fit the following; Chrysler 1946-52 with trico parts and electric wipers; Chrysler 1950 all; DeSoto 1948-1952 with trico and electric wipers; DeSoto 1950 all;  Dodge 1946, 1949-52 with trico parts and electric wipers; Dodge 1950 all; Dodge truck up to 2 ton 1948-49; Ford cars 1949-51 closed and convertible; 1951-54 Henry J;  Packard 1941-50 all; Kaiser-Frazer 1947-50 all; Lincoln 1951 IL models; 1950 Lincoln OL models; Lincoln 1949 9EL models; Mercury 1949-51 all models;  Plymouth 1949-52 with trico parts and electric wipers; Plymouth 1950 all; This is the type with the polished shiny stainless steel frames and the rubber inserts have the bumps.   Parts are new never used and in excellent condition.   These fit arms with the hook or pin type on the end as is and also fits the ones with the saddle type with adaptors that are included.  Please see close up photos of back of box.  This is the type with the shiny stainless steel finish and are hard to find these days.   Buyer to pay shipping.