Looking to find OEM parts for K1 Max

Has some issues with my K1 Max.
The filament in my printer jammed yesterday and it would not extrude nor retract. I unlocked the filament and tried to pull it back, but it would not move. It appeared to me that perhaps the motor had stopped working which is the cause of the filament be locked in so tight. I finally was able to pull the filament out with great difficulty. I would like to have a new stepper motor, hopefully on warranty, but will purchase one if I have to. I need my machine and it is going to be down until the circuit board arrives. How can you assist me?

While I was searching on the net for possible solutions, I noticed that there is and upgraded Hot End. It is described as being superior to the original. I would also like to get one of those. Where do I purchase OEM parts for this machine?

Have a look at Amazon or Aliexpress, the former being faster delivery but more expensive.

I have looked on Amazon, but given my lack of a detailed understanding of exactly what I am looking for, it seems that I need to find somewhere that is says this is for a K1 Max.
Some of the ones I have looked at seemed to be only the motor and not the entire drive.

Latest version with tensioning spring built in too that is the extruder. Complete assembly