Hi Dennis, I did mine just over 6 years ago... brilliant upgrade (pardon the pun).
on my install with some pics. Stripped the nosecone down to make sure I could support the ballasts OK. Think newer ones probably come with smaller ballasts.
I didn't buy from within OZ, but there were some posts from others who have, eg http://www.xenonoz.com.au/index.php
There's another mob found with quick Google search http://maxvisionaus.blogspot.com.au/
Compare with the forum sponsors product and see what costs you'd be up for, pretty sure they are all much cheaper now.
When I recently had a H7 bulb turn colour
on me (from "white" 4300K near end of life it went bright blue) I bought a replacement set from Ebay (out of HK) pretty cheap, identical bulbs to those purchased in US kit originally.
Check ebay too, here's a local Sydney reseller flogging kits click
but whatever you do, go for 4300K bulbs, as they are "white" rather than blueish which you start getting from around 5000K and upwards.
Oh, and 35W is enough. No need to buy 55W as far as I can see, and the XenonDepot guy even has some warnings at to why not on his webpage
, scroll all the way down.