They should bolt in, but the SRS will not operate without some additional work. At the very least, you will need to replace the SVT seat belt buckles with those from your original '01 seats. If your '01 has a driver side seat position sensor, you may need to swap it in place of the one from the SVT.
A swap for SVT seats is very much worth the effort, as they are far superior to base Mk.1 and Mk.1.5 seats.
Good luck, keep us posted on your progress.