There's always slider pins, but just start pulling things apart and you'll see where the bolts are located

Just do one side at a time so you can check what parts go back where.
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Dave '07 M3 GT - black
Adders: backup sensors, current limited hi-beams (for long life), Fog light on with running lights (t=44332 PAGE2), low beam aiming switch adjustment (t=47722), dash squeak reduction, badges removed, door bumpers removed, auto up windows, under seat subwoofer, True hidden hitch (t=53213)
Info / help: outside running lights only as DRL (t=54453)
link example
http://www.mazda3club.com/showthread.php?t=54453