FSA Mega Exo Bearing, Bottom Bracket Plastic Cover MS183,  230-4006.

FSA Bearing cover, will fit the below Bottom Brackets and Cranks:

BB-9200

K-Force Light MegaExo MTB

BB-9050

Team Issue MegaExo MTB

BB-8200

K-Force Light MegaExo

Neo Pro TT MegaExo

BB-8681

SL-K Light MegaExo

SL-K Pro MegaExo

SL-K MegaExo

Any questions please ask