In case anyone else is following this process thanks to Peter and GT this might help. The rebuild kit for the rear calipers from the MA70 has this Toyota part number:
0447914110 - about 77 dollars
I tried to get a rebuild kit through PBR but was told they have stopped making one!
Toyota wanted 5 weeks to get the rebuild kit! I got one through IBS - part number is K2041S. 65 dollars per side.
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