Help needed - I broke the subframe bolt

[BigKriss]

Trying to remove the 22mm bolt that goes through subframe bushing to add Bruno's rear subframe plates.

Curbed Bolt - 51718181460
Collar Nut (22mm) - 33331126136

Part numbers 6 and 8 on etk. http://www.realoem.com/bmw/showparts...19&hg=33&fg=30

I contanted the dealer and it will take 3 to 4 weeks to come from Germany and will take cost aus$60. I'm thinking on contacting bma auto parts instead, or trying to get them locally from a hardware store. Anyone know how long the bolts are?

Do I have to lower the subframe to put the new bolt in from the top? Or is there another way- I haven't done a job like this before.

Regards

Kristian