BN m1 drives are incompatible with the vanguard 42” eboosted enclosure if you use 6374 or larger motors.
I have tried both 220mm and 270mm BN hangers, both only allow reverse mount of motors. Reverse mounting is incompatible with both front and back of the enclosure. The 270s might allow a standard mounting if you use the straight cut gears which i beloved are larger, but I don’t know. With the helicals the can hits the hanger before the teeth engage.
It might be possible to make the 270s work in a standard mount if you grind away the ridge on the hanger.
It’s possible to reverse mount with both hangers at the highest angle BN adjustable bases plates go. Needless to say I don’t consider setting my rear base plate to an absurdly dangerous angle a solution.