I ordered a Screen Protector for my 5D MK III from Amazon, but the vendor (Not Amazon) had put a screen for a 6D in the package.
Amazon refunded me, but I now have the screen protector that I can't use. Its a GCS Glass Protector and looks to be of reasonable quality. It uses static electricity to cling to your LCD, no adhesives involved. There are two pieces, one for the rear LCD and one for the top.
I installed it because it seemed to be the right size when I held it up to the camera, but it was about 1/32 short of fitting. I put the protective covers back in place, I'm sure you can use it just fine.
I'll mail it to any USA address, and when you get it, just send me something to cover the postage. If you are not happy with it, just toss it.
Send a PM. I'll remove this as soon as someone responds with their name and mailing address.