I have two ECUs out of two different e30s. Both work and came out of running cars.
91 325ix - "0 261 200 524"
and
87 325i - "0 261 200 153"
$50 each plus shipping.
91 325ix - "0 261 200 524"
and
87 325i - "0 261 200 153"
$50 each plus shipping.