Generally any 900 series ecu work. (the 951 part) Best get an 8 valve one, if you get one with the fan output (some 740 & 940 models) you can run an electric fan from the ecu with a little wiring.
Berrys have a massive bundle of them if you are keen for the exact part number. They can post.
Finding one here would be cheaper, Berrys quicker.
