Part #STD533107
The manufacturer no longer makes this part, and there's no substitute part
Part #20613
Replaced by #420613MA
Part #STD541431
The manufacturer no longer makes this part, and there's no substitute part
Top half diagram
Part #17X102Z
Replaced by #703128
Mower housing diagram
Part #20551
Replaced by #492574MA
Lower half diagram
Part #10851Z
Replaced by #10851ZMA
Top half diagram
Part #STD551025
The manufacturer no longer makes this part, and there's no substitute part
Lower half diagram
Part #37X5
Replaced by #37X51MA
Mower housing diagram
Part #2X39
Replaced by #2X39MA
Mower housing diagram
Part #20619Z
Replaced by #20619MA