thanks for starting this thread. Thanks to your notes and pics I was able to figure out what to do with the rear calipers. Before reading your post I was kind of wondering how come C-clamp has no effect
Anyhow, I was able to put new brake pads on.My pads are notfrom Canadian Tire though.I bought them from TireRack, and the brand is Akebono. I think they might be the actual OEM (or very close to) without the outrageous cost. At least some website claimed that OEM on Malibu Maxx are Akebonos.
The thickness of the rear padsis 14.8mm (0.583") for the interior one, and 14.64mm (0.572") for the exterior pad. They are probably just the same thickness but I show the actual measurements.
Did you make sure that the position of the piston allows for the pin on the internal brake pad to fit in the slot. Please take a look at my photos to see what I mean. Only the internal brake pad has a pin. The externalhas aflat on the back of the pad.
By the way, I have no idea what rigid mount you are talking about. Both of my caliper pins move freely, as on every other car I had before.