Wanted: Mylar for sprung MITSUMI 65XE/130XE/800XE keyboard

[flashjazzcat]

As it says in the title. I have a sprung MITSUMI keyboard for Atari 65XE/130XE which is in excellent condition apart from the plastic mylar layer from inside which is badly oxidised and just about beyond repairing. If you have a spare SPRUNG (not rubber cup) XE keyboard, I'm interested. The outward appearance is unimportant: all I require is a mylar contact sheet without breaks.