WTB: SLX/Deore Caliper; Headset, Schwalbe Tyres

Would rather buy decent second hand spares than new, so to make up a second set of Shimano brakes I need:

• SLX M7120 4 pot Caliper (front..? but I think they’re both the same)
• A Deore M6120 4 pot caliper OR a set of pistons (i’ve got one with a chipped piston)

Also interested in 3(!) sets of Schwalbe tyres:

• A set for eBike (29″ Magic Mary/Tacky Chan?)
• A set for bikepacking/XC (29″ Thunder Burt? Rocket Ron? Advice sought…)
• A set for the gravel bike (700c 45 or 50mm G One R, tan wall)

Finally, I need a headset for an incoming Cotic Bfe:

• ZS44 Top Cup
• EX44 Lower Cup
• No idea on brand; they use Cane Creek 40 (but don’t have stock)