I was talking about the flange pattern, not the actual rear housing.
I emailed HPIAB today about some prices on some items. Haven't received a reply yet, could anyone tell me a good place to get copper washers from for braided lines, and a turbo manifold spacer. I am thinking ATS, maybe?
I went with the slightly bigger rear housing as that was what about 75% of people are recommending in the Forced Induction thread, and also a few tuners i have spoken to. As it is also going in my daily, it gets driven to and from work, so the speed limit is 60-100kmph, so i saw no point in having a turbo that spools too early. But if my engine dies, it has given me some head room for when i rebuild the RB25.
Shame i wasn't online to see your photoshop Andrew, serves me right to attempt doing my tax via etax.