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VIN is actually JF1GF8KJ4YG039905 Engine is an EJ201 SOHC
From a MY2000 Impreza Sport Wagon.
Unfortunately, info for MY99/00 UK models is limited unless you have a copy of the paper (General and Europe markets) manuals.
However the MY01 also uses the EJ201 SOHC engine and a similar 3 plug (3 rows of pins) ECU (T9 instead of the D3).
Hopefully the attached pdf's may be of use along with this chart