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Not sure dude. If the bike fit has a set position and you know the angle and length you need I'd do your best to match it.
This is quite useful btw
http://yojimg.net/bike/web_tools/stem.php
I was debating this last night and maybe thinking getting a less extreme pro vibe -10 to be the safe side instead of length, but I'll lose the degree and stack height. :/