Hi Aelx2k:
Sorry I do not recall for certain as I have had it almost 10 years (must renew in '08). This item is made of rather thick very clear plastic and is an exact, tight fit.
I believe the passport expeditor who I paid to acquire the passport on short notice for me applied the cover as part of the service. Remember, the item should be quite inexpensive but I do not know where to acquire one. Oh yes, I can assure you that the one I have has been quite durable as I use it often and treat it with abuse.
One thought--why not try passport service organizations in your area?
Good luck, I hope you find one as I think it will alleviate your problem.