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I apologize for the delay in responding to your message.
I think I can help you get the additional gears you are looking for. I originally modeled this project back in 2013. I have since changed studio spaces and work stations. I have the CAD files, but misplaced the original Gearotic design files, so I had to go back and work at recreating the gear specifications.
I've attached the specs for the existing 32 tooth and 24 tooth, plus a 20 tooth, and a 12 tooth. When I get some time, I will create those two additional gears and add them to the set.
BTW, there is a slightly newer version on my web site: https://www.worksbysolo.com/free3dmodels/
Let me know if I can help with anything else.
-- Bernie Solo