the bigmaxximum should fit the tdracing mount. according to this pic, the plet has a diameter of 43mm, 25mm spacing of the mounting holes which are m3.
send him an email with the drawing of the motor. he might have to adjust the mount because of the 3mm flange. I had a flange on my neu 1521 and ruined the front cap. A new cap is one the way with the flange sanded off.
and he will ship over the pond...