Because a certain retailer in the UK current has an incredible deal on RockShox forks and is including a free headset, I thought I might throw some cash into my much abused Trek.

It's a 2005 Trek 3700 , and the headset is completely shot after ~2,000 miles commuting and being used as a city bike without much maintenance. My question is whether a headset like this could replace the semi-integrated headset that's currently in there.