I got mine from a sign shop.. The guy who does all my vehicle lettering, and biz lettering. I'd think any place who cuts letters or does wraps would have it. My guy just gave me a sheet of it.
It's easy to work with - I just removed the backing as I laid it on there and worked it down using a rag to push out any air bubbles.. Once the sheet was over the entire area I simply used an exacto knife and ran it around the inside. Then used a flat blade screwdriver to push it down around the edges between the bowtie and the grill..