This one is from TRIANGLELABS, but same exact kit is resold by many sellers…
Trianglelab&Phaetus DXC Extruder Without Motor Extrusion Mechanism Kit For CREALITY K1 K1C K1 Max 3D Printer Part Upgrade Access
$29.21
Aliexpress
Price after $2 off store coupon (use SOQ2862WZUTI if you don't see it on page), and code USAFF4 at checkout.
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