I don't know about a graded Fox but the 2 different sourced repo butt plates I have purchased for a 12 & 16 were both too small to allow for working down to match the existing size/contour of the butt stock. A Large Rifle butt plate from Brownell's works out perfectly. Holes match, serations in the plate match, with plenty of material to work down. They are thicker which is OK with me for a little extra LOP, but no ring around screw holes. Will probably need to set the screws deeper in the plate.
