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Friday 16 March 2018 at 09:56
You could try contacting the guy on Youtube that put on this video: https://youtu.be/Oev_IAJbipM
His seems to be a System 3-version as well, according to John Norris on ipdb.
Good luck with the search! I just bought a Bad Girls yesterday. The game rocks!
Source: http://pinside.com/pinball/forum/topic/gottlieb-bad-girls-system-3-roms-#post-4283764