Thanks DGGarges for taking the time to make these excellent models. I was looking for the model for a 151-223 micrometer head. Although it's not obvious from Mitutoyo's website, I did find the model I was looking for, and it looks like there are several others available there. Maybe it will help you and others in the future (see link below).

Link (2017/11/21)

http://www.mitutoyo.co.jp/eng/products/micrometerheads/pdf/3D_mh.htm