Clear Single Visor - Use on HGU-55/P, HGU-33/P or HGU-2A/P single visor flight helmet, cut for MBU-5/P or MBU-12/P oxygen mask. Unissued (NEW), Excellent, and Good (Display Only) conditions available. Size Large [PN 32H1298-12, NSN: 8475-00-756-4513] Size Medium [PN 32H1297-12, NSN: 8475-00-756-4516]"