You must have missed this in the midst of your misery.
http://www.zggtr.org/index.php?topic=21700.0
There seems to be a supply of suitable units in UK going cheap.
Isn't it the ABS ECU you're after - that black plastic part of the ABS unit? The ECU comes as part of the complete unit.
Tree, how did you resolve this? As per sportytoes in the linked thread above? Just curious.
Understood. Sportytoes reported that he successfully swapped the ABS ECU (electronic bit) to solve his problem. His admonition was - DO NOT remove the pump unit from the valve body, only the ECU from the opposite side of the valve body.