Hi Dave,
I've just looked in my manual, I'm afraid I may have been a little misleading by saying there is a part number. It shows you how to replace the blades in the wiper arms. Which isn't difficult at all.
I could have sworn I saw one, when I got my last set a couple years ago, I'm about ready for a new set of blades....so If they don't try and convince me that there's only the full arms available.
I'll get all of the relevant part numbers and post them up on here, when I can get around to it.