Hi Ikequan,
Both Katz-eye and Haoda (the better known alternative split screen manufacturers) do not make split screens for full frame d-slrs as yet. I found the following company that makes it for both the D700 & the D3, but the user reviews on dpreview are not favourable...your mileage may vary.
http://www.brightscreenstore.com/store/
Do a search on dpreview to get user commenst.
Good luck.
Gorby