Tracking matte

Here's my problem. I have a shot where I need to blank out a license plate, but I want this to look realistic (no gaussian blurs!). So I thought I could just replace the license plate with another, but the car bounces a bit when the driver gets in. I want to place on a matte I drew up in photoshop overtop to get rid of the plate, but manual key framing looks un-natural. Is there any way to track the motion of the bolts on the plate and apply that movement to my matte?

the stabilizer in FCP totally blows but if it's all you have access to, it's you only weapon.
If you need this to work well enough to be invisible, you have no choice but to use the proper tools. Shake, combustion or After Effects. If you don't need a decently invisible effect, FCP can do it for you. Stabilize the bad shot, render, import. Zoom in to about 300% and tweak your insertion plate one frame at a time. Render. Import. You might want to add some shakiness back into the stabilized shot.
That's four renders. Not good.
bogiesan

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