Caliper attachments for measuring distances between hole centers

Since I did not manage to adapt the parts well to my caliper by scaling, I have designed them from scratch. It now fits for my caliper which is 3mm thick. Because I noticed that there is a slight offset to the reference plane (zero position) due to the radii, I have set the end position free. 

I added the Fusion 360 File, so you can adapt it to your needs.

You may also be interested in my caliper wall mount