You'll need wobble bolts. They're basically wheel bolts that have movable tapered seats so that they can sit slightly off-set from the hole but still bolt on fine. I think the difference in PCD must be less than 2.5mm, so it'd be OK to use them to go for 5x98 --> 5x100. I don't know where you can get your hands on some in Australia but I know ECS has them.
Alternatively you can have the original holes slightly widened (professionally) to accomodate the 100mm PCD. More ghetto though.
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