Scott's topmounts are from an '05 STi, so those certainly won't work. Unless the springs are SUPER cheap, the added cost of a set of '03 topmounts (whether new or used) should definitely be a deterrent.
There's also a chance the height and weight balance may turn out all screwed up. Taking into account the fact that the GD body weighs a good 400-500lbs more than the GC/GM, and that coilover production is split at -'01 and '02+ (offering a hint that there are some significant differences in suspension requirements), I'd feel uncomfortable running springs that were made for what is essentially a totally different chassis.
I'd say that a set of MY-appropriate springs would be well worth any extra money.
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