I do not know of any place that makes them but I was thinking about doing the same thing. To curve the plastic I assume that it would work to heat it with a heat gun or place in the oven to soften it and then mold it to fit.

What I am trying to figure out is how to mount it to the bumper and look clean.

Also I was wondering if the curved plastic will distort the light to much or if it will not be noticeable.

Keep me updated on what you find and I will do the same if I get around to doing it.