They bought them from the shops* and repainted them, as Koga were team sponsor of KNWU but didn't have a competitive track frame at the time. Now they ride Kimeras, whose design was obviously influenced by the BT but is an entirely Dutch affair
*I made that bit up - they may well have got a deal from the BT factory, given that it was obvious to everybody that the Dutch team were on BTs.
what does BT stand for?