I cant find one, and i dont think your going to be able to get one new, from anywhere really. Not only did they never sell them here, they were made in very limited numbers in the countries that had em.
I looked all over subaruparts.com and I cant seem to find the part number for the plastic door sill caps that run along the bottom of the door way (not on the door itself) and hold the plastic panels/trim in place. They look like they are square and will fit the rear door sil as well.
Thanks in advance. I'll provide pictures when I get home from work today incase my description isn't clear.