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All Kirby Morgan® helmets that use modular communications.

500-010 SL 17B Helmet w/Posts w/455 Balanced Regulator,
500-011 SL 17B Helmet w/MWPC w/455 Balanced Regulator,

500-040 SL 27 Helmet w/Posts w/455 Balanced Regulator,
500-041 SL 27 Helmet w/MWPC w/455 Balanced Regulator,

500-050 KM 37 Helmet w/Posts w/455 Balanced Regulator,
500-051 KM 37 Helmet w/MWPC w/455 Balanced Regulator,

500-599 SL 17C Helmet w/Posts w/455 Balanced Regulator,
500-600 SL 17C Helmet w/MWPC w/455 Balanced Regulator,

500-700 KM 97 Helmet w/Posts,
500-701 KM 97 Helmet w/MWPC,

500-710 KM Diamond Helmet w/Posts,
500-711 KM Diamond Helmet w/MWPC,

505-088 Adjustment Knob/Packing Nut Assembly,
505-455 (order P/N 525-765) 455 Balanced Regulator,
525-356 SL 17C/K, KM 37 And 57 With 455 Regulator Soft Goods Overhaul Kit,
525-359 SL 27® With 455 Regulator Soft Goods Overhaul Kit,
525-364 KM 97 Soft Goods Overhaul Kit,
525-367 KMB® 18/28 With 455 Regulator Soft Goods Overhaul Kit,
525-718 Stainless Steel Balanced Regulator Rebuild Kit (For SuperFlow® 450),
525-757 SuperFlow® 450 Regulator Parts Upgrade Kit,
525-765 Conversion Kit, 455 Regulator For 350/450 Regulators,
525-767 455 Balanced Regulator Rebuild Kit,
525-769 Conversion Kit, 455 Regulator For KM 77,

500-710 KM Diamond Helmet w/Posts, 500-711 KM Diamond Helmet w/MWPC,
500-700 KM 97 Helmet w/Posts, 500-701 KM 97 Helmet w/MWPC, 505-086 Regulator Cover Retainer Assembly, 505-373 Regulator Cover Assembly, 525-761 KM 97 Water Shroud Kit and 505-455 (525-756) 455 Balanced regulator