I changed my rear brake pads (V50 T5 AWD) a couple of months back and found none of the adaptors in my brake pad kit (similar to that in the photos posted above) fitted the piston indents.
I don't know if Ford/ Volvo used an unusual size?
In the end I resorted to long nose pliers inserted into the piston indents. Not easy to get enough leverage to rotate the piston back in the caliper. Not fun but did the job.
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