These are in alpha order by mfgr.

XS11 Spark Plugs

AC Delco:
R42XLS
Rapid Fire #AC-4

Autolite:
#ASP-63
Platinum #ASP-AP63
Double Platinum #ASP-APP63

Bosch:
Bosch #BSA-7500
Bosch Platinum #BSA-4216
Bosch Copper Electrode #W7DC
Bosch Platinum Electrode #W7DP
Bosch Super 4 #WR78


Champion:
stock# 3415 - Mercedes plat
Champion Standard #N9YC
Champion Internal Resistor #RN9YC
Platinum #CHA-3415
Copper Plus #CHA-415
Champion Wide gap 0.032" (0.8mm) #N9YCC
Champion V tip electrode, Gold Palladium Tip #2415
UN79Y=ngkBP6ES
RN10Y=ngkBPR6ES
RN10Y4=ngkBPR6ES-11


NGK:
BP6ES
#6764
#7333
BPR6ES #7131
V tip BP6EY
Platinum BPR6EVX
BPR6ES-10 widegap
BPR6ES-11 widegap
BP5ES #7832


Splitfire:
#SF6C
Triple Plat #TP6C