If its an sti it should have a 6-speed gearbox. Get the full running gear, box, shafts, hubs, diff etc and thats worth 2-2.5k if all working. DCCD worth more too.

Front Brembos go for £450 if decent
High rear spoilers sell well too.
Seats should be recaro if an sti, not sure what the wrx has, think they are still recaro tho.

I had a bug eye - round headlight 2001 reg UK300, that was a little different to the norm with kit, interior and wheels.

Dont suppose you got a pic lol?