You can usually work around the thickness / pistons problem. As you're removing the old pad, when it's half out just kind of push it back and forth to push in the pistons, and then swap over to the new pad ASAP before they slowly push back out again. You may have to get the new pad started on one piston first and then wedge it under the other one, and/or let the brake rotor move around a little. It can be a pain, but I've never failed to get them in, even with extra heat-shield shims in the front.
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