Have a look in this thread here:
http://www.ozdat.com/forum/viewtopic.ph ... 8&start=15
This guy had his steelies widened to 7 inches and guard rolling was required. I think if you just widened your to 6 inches and didn't run an especially wide tyre you should be okay, even if you do lower the car.
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green200b - aka Alistair
The fleet:
Australia:
'80 200B GX - the
green200b - hibernating
'81 RX-7 - 12A extend port - daily
'74 RX-2 - 13B bridgeport - cruiser
Europe:
'93 200SX - CA18DET - tourer
Green200B has forgotten more about 200Bs than we will ever know.