E450 Rear Brake Pad Replacement - long post w/pics

I bought my front pads at a NAPA, the rear pads at the local Ford dealer. I asked the Ford guy what he charged for the front pads and they were within a couple of $ of the price I had paid at NAPA. BTW, I replaced the front calipers and pads last Summer as I was sometimes getting a pull to the left when braking. Much rather do the job in the driveway than have a caliper seize up 1,000 miles from home in the middle of nowhere.