the original is like mine made of plastic which has broken due to being hit by a rock. they just added a rubber shield to gain strength. make it some hole so water does not stay.
it's boost and 27.5 wheels. Headset they can include, common size not internal routing. U can order only frame, motor and battery to them. it's the same mounting with M510/M600/M560, but I think M410 is enough. It has 75Nm power, the same with M820. I already tested for a while.