According to the manual, page 68:
Rule #2: You can install any filter in any slot, and can leave any
slot empty in anticipation of installing a crystal filter there later.
However, you should install the widest filter closest to FL1, the next
widest to its left, etc. Here are two examples that could each apply
to either receiver, assuming you follow the rules above:
FL1 {saved for FM filter}
FL2 6 kHz (AM)
FL3 2.8 kHz (SSB/CW/DATA)
FL4 {saved for variable-bandwidth filter}
FL5 400 Hz (CW/DATA)
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