From the evidence seen in the photos of the Vestax turntables, it would appear that Yamaha Chose some 'off the shelf' designs for the GT 2000 arm. In other words, arms that had already been developed by another OEM tonearm specialist, that were known in the industry to be available for anyone who wished to put them on any turntable that was being planned. We see now that the YA-39, the YSA-1, the YSA-2, the Vestax PDX 8000,the Vestax DPX-6000 arm were all design variations of this arm. There are differences in the arm tubes. There are differences in the headshells, but from the flange where the tone arm pipe joins the pivot they are essentially identical. Again, look at the first Vestax photo I posted above(the silver Vestax). You see a cover plate closing off where the tonearm wires would exit the arm pivot block when the arm is on the GT 2000. There is also the wide channel in the base for the GT 2000 arm interconnects to exit the rear of the turntable. It is the GT 2000's arm with a different arm tube, on another company's turntable. Obviously Vestax chose a similar arm out of the OEM arm maker's catalogue for the PDX-8000. For the DPX-6000 they chose the identical arm to the YA-39.