A 32 mm wrench will loosen the nut on the fan clutch. It is a left handed thread so make sure you hold back on the fan pulley. BMW makes a special tool to hold the pulley in place while backing off the 32 mm nut. You might be able to fashion something like using a screwdriver across the bolts and jamming a rag in between the fan pulley and the belt. The 32 mm wrench, is a thin side type that will fit into the small clearance area. Without a hold back on the pulley, it will probably spin. Usually a quick sharp blow with a small hammer on the 32 mm wrench will break the nut loose. Once it's loose, remove the fan clutch along with the broken fan. You will probably have to remove the radiator shroud to have room to get the new one in. Hopefully the fan clutch is not damaged, if it is, it will need to be replaced.
Other members in Australia have had good luck ordering parts from BMA as Alex indicated. You can use an aftermarket fan blade as shown on their site, to save some money. The fan clutch is rather pricey though for the 535, and usually runs about $125 USD. Determine if you have a broken motor mount and transmission mount so you can get those ordered also.
I wouldn't drive the car any in this condition, you can screw things up. The engine needs to be balanced, and this will put undue stress on the crank, not to mention all the other accessories.
Try one of the paint-less dent repairs in your area, they might be able to touch up the paint after the dent is repaired. To do it right, they will want to respray the hood. Also, check with your insurance to see if this is a covered mishap on the road. You might be surprised...
Good luck, hope this helps...
Jr
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