Hi Userminenine,

These files are green for the night "the_dark" and orange for the day "the bright".
So just replace the following files that are in each resolution folder: xxxhdpi, xxhdpi, xhdpi, mdpi, ldpi and hdpi !
spr_route_progress_track_landscape.bmp
spr_route_progress_track_portrait.bmp

But if you know which folder your device is using, just replace the files in this folder !