What are 944T front hubs made from?

[EvilOval]

I need to know what grade (ie 6061/7075...etc) of aluminum 944t (87 and up) front hubs are made from. And the bonus question on top of that would be whether they are forged or cast (I can't really tell).

The main reason I ask is that I'm having a set of custom hubs made and would prefer to make them from the same or better material than what Porsche uses. I have made a set from 356 (modified CB's wide 5 units) and they work fine.....but I'm not comfortable using them and spend every weekend checking them for cracks (and I'd rather not be doing that). I've thought about purchasing a set from VDubCustoms....but I can get a set made local using 7075 for the same price sans shipping. Any help on this would be greatly appreciated.