The featured items are Stainless Steel (brass possible on special order, see note below) Cadillac, Packard or Studebaker Script that are a good size and shape for a radiator decoration.  They come standard at about 12 inches in length, but other sizes can be made on request.  There are no devices to attach it and it is unfinished stainless steel.  I can make these in solid brass, but the cost will depend upon the desired thickness and the current price of brass.  I have a large supply of quality stainless steel purchased before metal prices went crazy, but I have used up my brass supply and replacement costs go up daily and are in the stratosphere.  As of 4/25/2022 a 12 by 24 inch sheet of 0.093 inch thick (2.4 mm) sheet of brass costs me $1,031.14 plus tax and shipping (Online metals dot com, look it up!).  Maybe I will start brass plating stainless steel???

I am a classic car collector who makes data plates and other items for vintage vehicles (automobiles, boats, airplanes, etc.).  I am blessed to have many expensive toys plus CAD/CAM skills that allow me to make things in two and three dimensions.  I can work in many materials including metal, glass, wood, plastics, Corian, cloth, leather, vinyl.  I have milling machines, CNC routers, a CNC plasma cutter, metal casting machines (small scale only), a small water jet, a 2x2 1,000 watt fiber laser, a 2,000 watt laser welding machine, a vinyl cutter, an embroidery machine, a metal lathe, plus lots of wood working machinery.  All I need is a good photo and measurements. 
Price will depend upon the material, size, complexity, etc., but will be inexpensive.