Are you trying to make a mock MPAA green screen? If that's the case, if I recall...
The "PREVIEW" and "ALL AUDIENCES" lettering are in Arial Black (in bold) typeface. You'll want to play around with the point sizes, but I think it's around 19-20 pt or so.
The rest of the lettering is in Arial (no bold), around 15 pt.
Then, apply drop shadow to the lettering and it should look pretty close.