My Sad Sprockets

[SDeMocko]

Here are a couple of pics of my sad sprockets. I am posting because they are not like pics of others I have seen. Most of the ones I have seen looked as if they were made from plate with the only machining being a tapering of the thickness of the teeth. As a lurker I think I remember reading that the early ones had counter bores like these but my carrier is a MKII. Does anyone have a DXF of the correct profile?
Thanks,
Stephen