Maybe this will help. I think it is #007 and it mounts to the bottom rear of the assembly.
Ref. Part Description Part Number Price
001 HEADLIGHT UNIT, R... 33101-SL0-A04 $1040.28
002 SCREW, SPECIAL TA... 33107-S0A-J01 $10.50 002
003 SCREW, SPECIAL TA... 33108-S0A-J01 $3.73 014
005 BULB, HEADLIGHT (... 33115-S84-A01 $9.30 002
006 BULB, HEADLIGHT (... 33116-SL0-003 $181.00
007 CONTROL UNIT 33119-S6M-003 $217.92 002
008 BRACKET, R. (1) 33123-SL0-A01 $20.55 001
009 BRACKET (2) 33124-SL0-A01 $20.55 002
010 COVER, RUBBER 33126-SL0-A01 $36.05 002
011 COVER (1) 33127-SL0-A01 $13.20 002
012 IGNITER, HID 33129-S5A-J01 $191.92 002
013 GASKET, SEAL (1) 33145-SL0-A01 $7.35 002
014 GASKET, SEAL (2) 33146-SL0-A01 $5.90 002
015 HEADLIGHT UNIT, L... 33151-SL0-A04 $1056.93
016 BRACKET, L. (1) 33173-SL0-A01 $20.55 001
017 SOCKET (T10) 33304-S5A-003 $9.13 002
018 SOCKET 33305-SH3-A01 $5.42 002
019 BULB (12V5W3CP) (... 34901-SB0-671 $1.30 002
020 BULB (12V27W45CP)... 34903-SF1-A01 $4.65 002
021 BOLT-WASHER (8X20) 93406-08020-05 $0.68 008