There are a few different ways to do it, some better than others. first there is the spray "chrome" paint, which never has the real look of smooth shiny chrome to it, but it is easy to get and apply. You could buy a role of "Chrome" tape online and take your time to apply it as smooth as you can around the curves of the back half. I think the best way is to send out the back half to an actual chrome plating company that does plastic chroming. They can apply it only where it should be as well as get the best finish. Also, from what I have seen on some NOS lights, is the reflective chrome is only applied to the back of the lens, the top and bottom were grey.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof, T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low