DO NOT USE THE ISOFIX. They are for child and seat not for the full weight of a grown adult.
As mentioned earlier, use a proper bucket seat and secure on a bar. Also remember the harness belt needs to stay as horizontal as possible before it goes through the seat.
For non-caged cars, the CG-Lock on the standard belt is the best option. 
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M3 CSL, Silver Grey, 2004, Factory de-limit, Alcon BBK, Rogue Rear Control Arms, Turner Top Mounts, Braille CF Battery
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