[NotYetLegend]

Thanks guys for the input. I called Porterfield today and they patched me straight through to a knowledgeable mech, they were very helpful, I really like the vibe I get from them. Anyway, he said there was supposed to be a backing plate or shim thing included w the rear pads (I'm positive they weren't included however). Anyways he said to just re-use the ones from the OEM pads which is easy enough to do. He said recently these rear shim things have started wrapping around the pad and add to overall size/dimension of them, meaning if you leave them off you get some slop. He said it wasn't dangerous to drive as is carefully until next weekend when I can get the car back up on the lift. Will update with results likely on Saturday night.