Are you sure you want to do that?

The manual posted on line here gives guidelines for snow chains.

• Narrow link chains only
• Rear wheels only
• Maximum 50 km/hr
• May be necessary to turn off stability control.

Sounds like a lot of trouble compared to using good winter tires. I suspect that the front wheels may have a clearance issue, and that the x-drive transfer case may fight the different front/rear traction characteristics, resulting in the above cautions in the manual.

If you do want to proceed, it may be worth posting in the regional Australia forum, to get suggestions on local suppliers. Or send a PM to Fraser, who you will find in that forum.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue