Here is a chart with STHIL model weed eaters and their compatible spark plugs:

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STHIL Model Weed EaterCompatible Spark Plug
FS40CMR6H
FS50CMR6H
FS56CMR6H
FS70CMR6H
FS80CMR6H
FS90CMR6H
FS100CMR6H
FS110CMR6H
FS130CMR6H
FS200CMR6H
FS250CMR6H
FS300CMR6H
FS350CMR6H
FS450CMR6H
FS550CMR6H
FS880CMR6H
KM55CMR6H
BR40CMR6H
BR50CMR6H
BR60CMR6H
BR70CMR6H
BR80CMR6H
BR100CMR6H
BR200CMR6H
BG45CMR6H
BG55CMR6H
BG65CMR6H
BG85CMR6H
BG100CMR6H
BG200CMR6H

Please note that this is just a general guide and the actual spark plug you need may vary depending on your specific model of Stihl weed eater. Always consult your owner’s manual for the correct spark plug for your model.