If you are using Luna without Skin you don't need svg images, just have them in png.
The images are located in gpsandmore_generic.zip/ui_nextgen/res/the_dark inside the folders of the various resolutions, the file is called loading.png.
Replace those images with your own respecting the names and dimensions.
Another loading image is also found in the_skin.zip file (same path) but should be overridden by the one in gpsandmore_generic.zip, at most you even change those images.
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