poor quality icons in wxGenericDirCtrl on macOS

The attached image shows the icons used by wxGenericDirCtrl in
the widgets sample on macOS.  The top icons are from wxMac 3.0.5
and the bottom icons are from wxMac 3.2.7 (and, in my opinion, look
rather ugly).

Where are the source files for these icons?
Is there any call I can make so my apps use the older icons?

Thanks for any advice,
Andrew

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