Oki Microline 520 Service Handbook page 77

P/N 51009501 Guide: Sheet (Wide) RSPL 521 B.2.02
P/N 53066902 Cover: Upper (Narrow) RSPL 520 B.2.02
P/N 53067002 Cover: Upper (Wide) RSPL 521 B.2.02
P/N 53067101 Cover: Access (Narrow) RSPL 520 B.2.02
P/N 53067201 Cover: Access (Wide) RSPL 521 B.2.02
P/N 53067301 Cover: (B) for card slot RSPL Both B.2.03
P/N 53562601 Knob: Platen (ML500 Series) RSPL Both B.2.03
ML520/521 ( 96-02-04 )