All Kirby Morgan Helmets except the SuperLite 17B.
560-074 Bottom Ring, 560-517 Stainless Steel Helmet Shell,
All shells with Bottom Ring Assemblies: 505-105, 505-106, 505-107, 505-108, 505-162.
560-540 Stainless Steel Side Block Body, 505-732 Stainless Steel Side Block Assembly,
KM 77 Helmets 500-090/-091, KM 37SS Helmet 500-100/-101, KM 97 Helmets 500-700/-701.