large ecu connectors in plenum

[casperdog21]

while working on my rover lpg I dropped the bracket that holds the IG1 reducer into the plenum chamber, after a while my arm looked like it had been attacked by a mad dog cuts and blood, it was a the gods are against me moment, I took the plugs off the ecu,s and did the dickhead trick of not marking them, two large ones interchangable so where does the one from the engine bay go
thank you