I don't think they ever made them in White. They would be color keyed to the Carpet color. It you have White with Red appointments they would be Red. Or Black, Blue, Aqua and so on,
Good luck with your parts quest. A Red 67 GT sounds like a fun little car.
You have that backwards Neal, the 67-68 kick panels match the seats & door panels.
Jose - Mustang reproductions are available from most vendors in all factory colors and fit the same, the only difference is that they don't have the punched holes for speakers. There's been some talk about finding a way to punch the holes in the repro panels, but that's not available yet. By now, almost all used originals are cracked and brittle. But the plain repros work just fine.