if you can't find it from one of our sponsors what about something like a larue tacitcal EO Tech QD LT-110 mount. It's a throw lever mount with and extra piece of rail so you can mount a magnifier or night vision behind the unit. My only worry would be the location of your buttons on the 552 facing to the rear.
Thanks all. Until a top rail extension is available I have solved my problem by replacing the Eotech 552 with a 551 which is 1 in. shorter. I know I trade off the AA batteries and battery life, but I can mount the NV behind it. I will post pics when I get it set up.
They show what appears to be similar to the Military Issue PVS-14 behind the factory installed ring sight. I can't realy tell how it is attached but it looks like it has something to do with the hole that you would mount the REM in. Might be worth looking into.