Part 2 is a bit small
First the Lflex needs its thermal double sided tape sticking on
And warm up the housing again and stick in the Lflex in the position shown
Then solder all your wires and job nearly done
the next bit is to read the Lflex manual and configure the driver to 3 or 3.5 amps drive and set the modes and thermal monitoring Job done you now have an approx 2000 lupin Hope vision 4 .
One more little point is the front bezel wont quite close up tight so a little silicon sealant is needed to make it fully waterproof .