Need some help with piston specs e30 m10

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I need to know the specs for a piston for a 75 2002 or 3.0 six engine (i guess they are the same?)

I am looking for pin to deck height, volume of dish.

Were the stock pistons forged or cast?

I have searched online but all I get are prices.

Reason I am asking is I plan to turbo an e30 318i with an m10 motor with an e-12 head and I am tying to figure out comp ratios and other possible sources for pistons. I know this would yield me 8-1/1 but I'd still like to know the specs.

If you can help it would be apreciated.
Thanks