Moe's light switches are popular on AliExpress but they are slightly smaller than the standard AU (and maybe others) GPO dimensions. 

That means that if you want to mount them on a mounting block they won't fit.

I threw this together fairly quickly but it does the job. There's a version with the mounting lugs above, and another which has them on the side.  

They print without supports and use your discretion on materials. I used PLA.