If it is tailored specifically to the D90 (rather than being a generic plate that happens to fit), then I would not expect it to fit the D7000. Even very small alterations in the shape and size of the camera baseplate from model to model will prevent such a plate being transferable.
I think if a tailored D90 plate would fit the D7000, we would have heard about it by now from the likes of Kirk and Really Right Stuff
Received our two D7000 cameras today. He is some info about the L-brackets from Really Right Stuff. The D300 L-bracket is not flat on the bottom. I has some ridges that hold a D300 flat and will not rotate. The D7000 is a bit wider then the D300. What I plan to do is grind the rear ridge of the bracket so that it fits flat on the bottom of the camera. Only problem is the vertical part of the plate cannot fit against the side of the camera if you want to use a cable release. I just left a gap and can now get the door open and the cable end into the camera. My wife has a D90 plate, that does fit on the bottom of the D7000 flat. She has the same problem with opening the door. Since she uses the remote, this is not a problem. Hope this helps. At $120 a RRS bracket a little inconvenience is worth $240.
Just a follow-up. I went over to my son-in-law's house. He is a woodworker and has lots of tools. He has a grinder for metal which we were going to use. It was slow and difficult to grind the rear ridge down. So he put it in a vice and we used a metal file. Took a little while, about 30 minutes, and we filed the ridge flat with the plate. Fits great on the D7000.
Most flat plates should fit the D7000 fine. Some of the plates are designed to fit the contours of the camera bodies and prevent any twisting and they won't be as likely to fit. A flat plate won't prevent twisting, but can be used generically. Also consider a lens plate as an interim solution or inexpensive alternative.
RRS is shipping their new two piece L-Bracket for the D7000.
I'm got a D7000 body, extra battery and grip in transit from Berger Brothers, and the L-bracket in transit from RRS.
My D80 Markins plate would not correctly fit the D7000 body - that is the bad news, the good news is that Markins is already shipping the PG-34N, which is made for the D7000. Mine arrived a few days ago, and fits fine.
I was told that the d90 plate would work by nikonians pro shop. That being said, I still bought one that claimed to be explicitly made for the D7000 directly from Kirk. I used the Markens plat on my d300 (since sold), but I must admit I like the kirk better. Its hollow design is both lighter, and works more convincingly with the fail safe pin on the Marken head I have. Ordering direct from Kirk, got the plate in less than a week. It was not yet in stock at the proshop, or I would have bought from them.
#11. "RE: D7000 plate.." In response to Reply # 10
I have several generic plates that fit all my Nikon bodies.
Kirk L-bracket is a different story. The d7k is slightly wider than d90 and so the vertical part does not clear it.I would assume that is the case with any custom L-bracket regardless of brand. The Kirk L-bracket for d300 does fit but it is not an exact fit as there is a little extra room along the vertical part.