Will 1968 Cougar door panels fit a 1967 or 1969 Cougar
XR 7 or Standard. No on both for 69
68 interior door panels will fit on a 67 door however you may encounter issues with the cutouts for the armrest mounting clips lining up. There are a lot of variables with your question. Mixing and trying to match standard, decore or XR-7 style panels on a door that did not originally have that style may require some rework to make everything fit and work properly.
No 67 or 68 interior door panel is going to fit on a 69 door.
Randy Goodling
CCOA #95