The Platemeister is another possibility...see link.
http://www.licenseplates.tv/platemeister.php
They are expensive, though, but I was real happy with ones for my 93 Missouri State Highway Patrol SSP. Ones they do have the raised letters. Eventually will need to buy for my 90 NCSHP...not sure if I'll choose to spend the additional money from them or go to the person referenced in further up in this thread.
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Mike
1992 Michigan State Police SSP Mustang #5114
1993 Wisconsin State Patrol SSP Mustang
1993 Missouri State Highway Patrol SSP Mustang P641
http://members.fotki.com/MOstang/