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Just installed part # 99635575561 (supposedly from 2004 996 with PSM) hydraulic block into 2001 996 hydraulic controller (which originally came with part # 99635575554). I am yet to test the system, but the hydraulic block and controller is a 1:1 fit.
Curious, shmo, did your -61 block have the hole in the brass fitting as shown in post #11?