Due to a few requests, I have done as asked and made a 6 label set to include a simple extras disk. This involved moving the images of disk 3 onward from my original set up in order to insert a new matching image for continuity's sake. Basically you will need to download the whole new set if you want the extras disk - I had to do it this way as the best image I could find matched the original disks 1 & 2, putting it at the end as disk 6 made the set look contrived, and badly at that. I hope you understand.
The new 6 label set can be found
here and there is a link on that page for a new (slightly re-designed from the original) cover which now includes simple details on the extras.
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“For me, it is far better to grasp the world as it really is than to persist in delusion, however satisfying or reassuring.”