I noticed you picked yours up on June 22nd, 2000. I'm pretty sure I picked mine up on June 27th!

It is the Mk5 (Mk4 facelift, 6N2000, whatever you want to call it), and was one of the first in the UK. The speakers (and visible grilles in mine) are at the front edge of the rear seat bottom, with the bottom of the speaker about level with the top of the seat cushion. I'd estimate they were around 8 inches back from the door opening.

It's not ideal placing, as a rear passenger blocks the speaker with their leg, but it gives good rear fill when I was on my own, or with a single passenger.