hellooooooooooo guys......

right, think i have traced my problem to a faulty abs ecu which sits on the drivers side footwell area. (original fault was the pedal went rock hard and pump stopped working). i have checked all fuses and relays as suggested etc, and cant find any faults. got power going into the ecu but pump not working. the pump will work if powered up seperately so i am thinking ecu knackered.
i have removed it and the part number is 85GG 2C013AD

i can get an ecu on ebay but the number is the same apart from having either AB on the end or AG.

any ideas if these will be ok, or has anyone got one i can purchase or even better try first??? pleeeeeeeease help. its a rs500 if you need to know, but i imagine a 3dr will be ok. thanks