Some time ago I acquired a Mosler CD120 combination lock which is a bit of a basket case and now I'd like to return it to working order for display (only). One problem is that it came with a key-locking dial ring but no key --

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First question, what is the proper blank for this? My best guess is the Ilco 1115AL but I have little experience and would appreciate an expert opinion. That blank seems a bit long, being for a 6-lever safe deposit lock; this thing is not very thick and has 5 levers. But it might be the best blank that's available. I was gifted a very long vault key blank that I could make work if I can't find a better one.

Here is the lock interior:

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Second, does anyone have depth/spacing information for this lock? What I'm hoping for would be similar to this document from Sargent & Greenleaf:

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