I've never seen a 11"x 2" drum on the front. That doesn't mean it doesn't exist though. I know for a fact my 73 4x4 p/u had 2" drums front and rear but the drums were not interchangeable from front to rear due to the centers being hub centric. I think typically the fronts are 3" and very often are a finned drum. rear 2 1/2" are typically finned also. I just sold a 67 Fury 1 and it had 11" x 2" on the rear (no fins) and what looked like a 2 1/2" on the front. (finned)