Here you go mate. The ballasts are the same size as the 50 watt ones.
http://www.ebay.com.au/itm/SALE-NEW-...item20c5343188
These are the ones I'm talking about. There also the only guy who sell the ballasts that I would trust in H3. I had a lot more options with the H9s and H4s I've got before. This bloke is very well priced compared to others.
Cheers Mick.