Dimensions of the Holosun 507C X2 footprint
All the distances are in millimeters.Looking for suitable mounting solutions?
A photo of the Holosun 507C X2 footprint

Red dot sights that share the Trijicon RMR mounting standard
Click here to find out more about the Trijicon RMR mounting standard.

is an optics enthusiast who writes articles and reviews in the field of binoculars, riflescopes, NV optics etc. Currently, he is a member of the Optics Trade team.
Summary

Article Name
Holosun 507C X2 Footprint
Description
Holosun 507C X2 features the Trijicon RMR mounting standard. Here, you can see the dimensions and the photo of the footprint.
Author
Andraž Gradišnik
Publisher Name
Optics Trade
Publisher Logo

Which plate should be used to mount a Villain 507 series on a Sig P365SAS?
I do not know of any such adapters for the SIG P365 SAS model. It would be best to contact Sig Sauer directly.