Stupid parts question, but...

Have any of you guys ever come across a set of brake pads that were to damn thick?
Here's the story, son comes over, needs brakes on his truck (2001 Ram 1500 if it matters). While he was out of town last week, the pads took a crap, so he pad slapped them to get home. Noticed that the left caliper was hanging up while he was in there.
Comes by the house tonight with pads, rotors and a new caliper w/ bracket.
We replace everything and we can't get the caliper down over the pads. In fact, they kinda hang over the brackets. I get to looking, and these things are a good 1/4 in thicker than the ones he bought last week to get home on.
We ended up using the pads he bought last week, but wasn't happy as they were AutoZone squeak master $15 specials.
I worked in a Mopar Parts room for years, never had anyone come to me with that problem, aftermarket parts are kinda a new thing to me. Anyone else see this?
It seems like I read somewhere that some vehicles have two thickness pads, and the thicker pad goes on the inside. If this is accurate, and, I don't know that it is, could it be that you have both of the thicker pads on the same side of the vehicle?