It's annoyingly misleading that these things are called "ribs", isn't it?
I honestly have no idea why they are labeled "ribs", and Google really has not been very helpful in answering this question for me.
They are actually cut from the shoulder of the pig.
Regardless, though, they are delicious.
I made some on the Weber Kettle last weekend.
They are pretty easy to make. I put charcoal in the "vortex" in the middle of my kettle and placed the "ribs" around it.