wheel size

Absolute noob when it comes to offsets and wheel size, any advice would be appreciated. Would you suggest a 25mm or 35mm offset for 19x8.5 wheels (square set up) for a stock 2012-2014 gt? And also what would you suggest if it had the brembo brakes?

Earlier this year, I had American Racing build a custom set of Torque Thrust 2 wheels (VN215) for my 2007 Shelby GT to simulate the look of the 1966 Shelby GT350 (including the open center cap). I deliberately went with a 17" wheel (instead of 18") and subsequent matched the appropriate tire...

Was wondering if anyone can give me information on wheel size for a 2005 mustang? What's the biggest wheel I can put under it ? It's been lowered a inch and a half in the front