I looked on the website of baileigh.
With the spindle bore being(Spindle Bore 0.787")
It would have to be MT3.
Link:
https://drill-hq.com/2012/04/morse-t...ensions-chart/
MorseTaperDimensionsChart
Taper# A D L B K
0 0.3561 0.2520 0.5625 2.3438 1.7813
1 0.4750 0.3690 0.7500 2.5625 1.8125
2 0.7000 0.5720 0.8750 3.1250 2.2500
3 0.9380 0.7780 1.1875 3.8750 2.6875
4 1.2310 1.0200 1.2500 4.8750 3.6250
5 1.7480 1.4750 1.5000 6.1250 4.6250
6 2.4940 2.1160 1.7500 8.5625 6.8125
7 3.2700 2.7500 2.6250 11.6250 9.0000