1938 D T MODELS: 80 ; 301 ; 304 ; STEWART – WARNER Speedometer PART No. ‘s : 509 – B D ; D T ( D MODELS ) ; 529 – A L ; D T ( S MODELS ). Application Information from 1949 Edition A.E.A. (Automotive Electric Association ) UNIVERSAL CATALOG of ORIGINAL EQUIPMENT SERVICE PARTS ; No. U9 ; 1938 TO 1949 INCLUSIVE .