What you want does not appear to be available and likely isn't possible without an optical element to correct focus.
The lens side of the mount has to be deep enough for the tabs on the camera body to fit into. Using the width of the locking ring as a reference, that depth is much greater than 2mm.
The camera side of the EF mount needs to be deep enough for the tabs on the lens to fit into.
The diameter of the mounts is such that you cannot recess one of them into the other.
The best you can expect to do is to position the tabs of the FD body against the tabs of the EF lens. That puts about 8mm between the flanges of the two mounts. You could probably get it to work if you removed the mounts and created a new custom fitting, but that no longer qualifies as an adapter.
The combination of adapters EOS-M42 + M42-FD, proposed by possumfacekid, would work if there were an EOS-M42 adapter with optical element. However, I could not find one. Perhaps it would be possible to add the optics from an FD-EOS adapter to the franken-adapter.