So, I just got my new fabbed exhaust in and it rapes my hangers. So much so that it rubs against something and makes bad noises. SO, I need to know the size of the hangers so I can get some less compliant urethane jobbies in there.
Are you looking for the length of the rubber hanger isolator things that go between the hanger bracket on the chassis and the hanger bracket on the exhaust? You can either zip tie the worn out rubber ones you've got or buy the Powerflex polyurethane ones from Goodwin Racing for $7.95 a piece.
Sorry, I can't help you as my car is hundreds of miles away right now. There isn't much difference between 8 and 9mm (I assume this is the diameter of the hanger rod we're talking about here). I replaced one of the hanger rods on my exhaust and used a slightly smaller diameter rod than the original and it still fit good and the hanger did it's job well.