Longer Wheel Studs question

Alright, in my quest to add the Dodge Charger 18'' wheels I've got for my Dart to the car, I am planning to add longer wheel studs and then space the front wheels out.
I've got the spacers, but now I need the studs.

What I'm wondering is if these are what I need:


Mopar Performance P4120610 - Mopar Performance Wheel Studs
http://www.summitracing.com/parts/DCC-4120610/

My car has disc brakes, but I'm not exactly sure of how long the stock studs are, or even how long these are...
Has anyone used these on their car?
All it says is that they're longer, but it doesn't say how long. :read2:

Thanks in advance!