Want to Buy K focusing screen for Nikon F4

Do you happen to have a K focusing screen for Nikon F4? I find the default screen not so easy to use for manual focus lenses, so I'm looking for a screen that is brighter and has focusing aids (microprism, split image). Thank you.

If you can't find one I have read that F3 screens can be used in the F4.
IIRC for best result the frames should swapped.

Chris