Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4587564.

I purchased a WEN 1" dial indicator from Amazon:

https://smile.amazon.com/gp/product/B07HFV25M9/ref=ppx_yo_dt_b_asin_title_o00_s02?ie=UTF8&psc=1

My guess is that this is similar to a Harbor Freight caliper. The back measures 53.25mm. Many backs for dial gauges come with a little tab so that you can mount the calipers. I needed mine flat, so I made one!

Not that it matters, but Thingiverse does not let you specify the Ender 3 V2, which is what I printed this with.