With the brackets cut out, apply the printouts from the motor specs ready for drilling the four holes necessary for connecting them.
Though these are for 3mm bolts I may well use a 4mm drill-bit firstly because it gives a little leeway for mounting the motors and secondly because I use the same bit for the pop-rivets and can't be bothered swapping it out.
We'll go for M3 Pan Pozi 8mm bolts at a cost of one penny apiece, I think.
Take a break now and make yourself a melted tuna-cheese toastie.