Lots of manufacturers Guide, Yankee, Detroit Signal, and others. My 47-48 Truck data book does not mention them as dealer installed but they are shown as arrow style in the 49' book and mentioned again in the 51' and 54' books. Search on eBay there are lots of styles available at wildly varying prices arrow atyle are expensive plain yellow or red lens style not as much. They do pop up infrequently as NOS 54 style in the original 4-lamp kits with wiring and brackets etc. Look to spend $200 or more on something like that.
