I have a 2004 2500 Silverado non hd. I'm doing the brakes on it and I'm having trouble finding the exact part number for brakes. They say you need to know if you have a 4 5/8 hub hole or a 4 7/8. Any way I can know without taking it apart and measuring? I would think I would be able to find the info somewhere but I've checked around a lot. Anyone know off the top of your head? Thanks, Dave.