I've checked on pypi.org and it appears to only have arm64 packages, has x86 with AMD been deprecated?

I'm looking for the source of the freestanding system images as I want to create a custom button in the same style. I've searched the filesystem and was unable to find them. I then tried to save one from the resulting NSImage, but its representation is NSCoreUIImageRep. I've found this one which is not part of the named images... /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Plugins/PMProxy.bundle/Contents/Resources/PauseFreeStandingTemplate.pdf but this one is the wrong colour and doesn't match the other icons. Does anyone know where they are so I can use it as a template for some custom icons?