[Collins] Help ID Filter Please?

[Les Zwiebel WB6ORZ]

    In what rig would this have originally lived? I must be missing something in my docs here.
        Rockwell Collins (blue label) "Filter, Band Pass." Cylindrical "pencil style" approx 2-3" long w/ solder lugs on the ends.
        "DLA900-84-M-KB20
        12/84
        FSCM No. (what's that?) 2X491
        P/N 526-9365-051 Filter Type LSB Carrier Freq. (kHz) 455 Min. Bandwidth 3 kHz @ 6 dB Max Stop Bandwidth (kHz) 6 @ 60dB"
        Cylindrical pencil style approx 2-3" long w/ solder lugs on the ends.
    Thanks in advance.
    (((((73)))))
    Les
    ---===WB6ORZ===---