I get mine from my local slot car track. The PU is plain, the Impala I modified with a file and sanding to achieve the inset line. They come packaged in pairs,you can cut them down to different heights and lengths to fit your hood. I use either Bondo putty, glazing, and the green modeling filler.
If you need more ideas to do these, maybe I could do a thread on installing one.
Hope this helps...Karl