Try Billet Technologies there are others as well where you can look.....
e-bay, SS Inserts, Shop Hemi.com, New Challenger store, Parts for your carFCY.com. and MS Performance are places I've looked and bought stuff.
I agree with Starchild. I have purchased the sill plates and the pedal kit, including the dead pedal from BILLET TECHNOLOGIES. A little expensive,but very nice product.