ANother option would be to trace the shape required on paper, scan it and save as an EPS file then cut it with a vinyl cutter as used to make signs. Spandex sells Avery vinyl and AGP (aus graphic supplies) sells the Oracal product.
The vinyl itself comes in a multitude of grades and colours. You can even get carbon fibre look or chrome.
Each rear side would cost about $5 max with good vinyl.
There also was/ is a company that made "skinz" that are a circa 2 mm clear plastic adhesive sheet designed to fit to headlamps. I does eventually go a bit yellow but expect to get at least 3 years out of it in outback conditions.
Or try a product like
http://www.xpel.com/